Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa520b7c576f5b3…

MALICIOUS

PDF

72.8 KB Created: 2021-07-29 17:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bc295062034ca3b7be6e1fbb913fe490 SHA-1: 69d0a03a5fa04e93a220180985715218c30c37b0 SHA-256: 9fa520b7c576f5b3207a13712baec76943f3157e7e22c5c099800debc95cef29
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute further malicious content through these compromised sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f3e4b436ecaf1668029037e01976b2ae/26990828920.pdf In PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/xuzotajowo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe33dbf96e---20673417720.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/40683840814.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/25519846923.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/parikukekomuzumil.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3fb2d44ca---1820005566.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/dupepamifaxoruzul.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a47f0a0cd---zuralerotowelitu.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/suvubawakiwub.pdfIn PDF document text
    • http://greenld.com/userfiles/sizevumover.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f1b074aafc10890cc7f47befdc8008d5/dojuxobofotusoriradavafo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/iii52apuktrmjusrtroneb9usr/mevukorizisolud.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/15754292431.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/kanaduj.pdfIn PDF document text
    • http://punaide.com/userfiles/files/dedun.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/eqha4769ti5cogrr3734sb7sgc/96013750902.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/83615803722.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/11161331002.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/61b5e45049a2a87860b8e917af7942f3/31813791537.pdfIn PDF document text
    • https://vestol.bg/files/file/vinujepesipa.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace93ded793---puweb.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/movawotagitifariduxe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uos2ulj2mio9uq4gq1d01fbjfb/62434756733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=calculus+early+transcendentals+11th+edition+anton+solutions+manualPDF 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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 15048 bytes
SHA-256: 7db59f68f94f38eb4835fe142ff970d532b189bb6265acc4615bc9d1fe6cbab3
font_02_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10932 bytes
SHA-256: acc7d19f85e0e878174ca59d46bc31283daba2e4f03b2435f49be0f9b732a7fc