Malicious PDF — malware analysis report

Static analysis result for SHA-256 612edb0ff4094902…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 09:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c2ed15c2d20622c5c0bdac6836600f0 SHA-1: ed738fd6b083123bdbce562a5a4ecbaaf7c17ecc SHA-256: 612edb0ff4094902ddf97176b65820754273c948d1f79a8a837de7da376f0ef1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to deceive users into interacting with these links, likely to download further malicious content or lead them to phishing pages. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://powerfalcon.net/uppic/files/56122990310.pdf In PDF document text
    • http://myucpb.com/userfiles/file/36077547845.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wikoduwuropamavu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/22275812482.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/39217576717.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffffe733b3---94784487532.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/navuvowoxetudixud.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/getonopudazetobopuradiju.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/darizorixewovexemopixuw.pdfIn PDF document text
    • https://motiv8workout.com/up/files/talutodil.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/lorenojetonedib.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/12488265384.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/51242181924.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4b9c1ba7851f8dc8fd6d6b484608a032/janazubiw.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844d25c3da---nedukusoruwazatu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/02399385a79a351eed3ef2e2d0d5df40/45013204053.pdfIn PDF document text
    • http://aven.su/userfiles/file/80710428628.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/10046662532.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b799ad4cfc26f2307f812f85d0a869a0/vigiwofepo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/cd63594ba4543ab754589a22d05c66c2/tixuzuwetikudotatunurej.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/zisexirat.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/44199929330.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/21568128512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+manual+invoice+number+in+tally+erp+9PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 17072 bytes
SHA-256: b41b71177f747edf8f94290aaa59373620b94cccf2eb7dce503693b8e4f1307d
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 11124 bytes
SHA-256: ca82cae05ca189fe5398d575300194b581156f44855629139175270314ef7c61

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