Malicious PDF — malware analysis report

Static analysis result for SHA-256 38269c16b6f4131d…

MALICIOUS

PDF

104.7 KB Created: 2021-06-29 00:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ea78a00c5f52bb6b78b825094da94e03 SHA-1: 88e16034c5d707908cfbe5a4fd5742c2d06bc406 SHA-256: 38269c16b6f4131d112934bd0008d1b6981c013d172e67330e7d3dc80fd28d0d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, aiming to trick users into visiting these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hnkingdee.cn/Files/file/202162902335.pdf In PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/81274952275.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eace1c707a---81039928883.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/golison.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/6fb3mvir2o93cv3kpoc458ft71/34018060005.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/81fe1b06b7ffb76e7fa40aba68c01e38/87860815137.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tejonozirikulubesu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/1tubaua725j4j5c6js1dpf673f/pirurabefafegeruvijiv.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c7abc8039---dugizuxenebozuviguxarug.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/xafisajegen.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9558802a5f6dd8a0444105c88865bca6/51192004738.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82128b345---50184261852.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160805fb0dde48---16509589136.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dolibep.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/3377469543.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab002764df4---zetopibuwivo.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/bc263f901df6b2a79945cbf60f991e46/67830604262.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/rimunoxoridalizu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ca4c084e52ae62f7e4497902224f725/rowazuj.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/38660212534.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160973d2a65274---6847276455.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c111af68---16516938160.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ba24c6f18---17348127858.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1483bd25307413cddf6ac2526362c11d/56937090939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=discrete+mathematics+practice+problems+with+solutionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_01_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 10964 bytes
SHA-256: e5894dc7b00e6e3373722cc950b505b2056d838818e9c80bd4adfc72c5b1c89e
font_02_sfnt_off000149ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AB 18696 bytes
SHA-256: 5a662cc1b50fa92c9ba4bc242d88446974a1a10022f17d119c405a3f7265041b
font_03_sfnt_off00017ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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