Malicious PDF — malware analysis report

Static analysis result for SHA-256 878cf597db7f4cac…

MALICIOUS

PDF

91.9 KB Created: 2021-08-08 03:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb9d3561244f27454555d3c434ae0f16 SHA-1: d1bec295f0fd6e2a503ea3066fe49b5d27227196 SHA-256: 878cf597db7f4cac1938c8c292f26b2f61e7ec090ded7a1af2925bd6c1547132
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://inwebjor.ru/uplcv?utm_term=how+to+calculate+resting+vo2+max PDF link annotation
    • http://rlangkhan.com/upload/userfiles/files/31540339246.pdfIn PDF document text
    • https://ambalatender.com/upload/files/zanig.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/tetazer.pdfIn PDF document text
    • http://jucal.es/images/file/pazifovib.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/97508619653.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/31259047709.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/63350204335.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabb088334---xidevisebe.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609440a7726de---kolov.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/12305684772.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/15341004455.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb065fd4da3---menowavalebakitafidumuz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fe74394a---lagadosewevofozi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/r7rpvh3k35b8ijac965cdb0vfu/4305628897.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2e4b61454d7701d89abf17f1d6c16b4b/jixugomugebufavitobak.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/34121256434.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/35358848621.pdfIn PDF document text
    • https://izometal.net/mm/file/zerinipigavokurafu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011237046150.pdfIn PDF document text
    • https://davnosti.ru/upload/27923370135.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/17ac7fb00e67db5dfb0050b8f9d2c591/54609890956.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/nixawuf.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ltrgc8sthqne8jtpbi7oj0o397/31498679541.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/joloz.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 11040 bytes
SHA-256: 22d0d9714ded0fa01f87cdf09808bb18a825ad5eb14987ff8b5621226aae869f
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 19288 bytes
SHA-256: 597e6be2fdd0abda74d79b03d17e7a4d43e924676804e605758d8770cfcf0376

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