Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b68265c13bf85e…

MALICIOUS

PDF

93.8 KB Created: 2021-09-17 23:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed26d8b4b3f55c40c30706e3e2537793 SHA-1: 21d16db0789fb9a65c58b7f1a10007676a4ee4fe SHA-256: e2b68265c13bf85e26fef166f1c2ebb40a83a62fd62977ed46e3f1a7918f07c2
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It contains an embedded JavaScript stream and presents a link farm on compromised WordPress upload storage, masquerading as a download button. The document body is heavily obfuscated, but the heuristics suggest a callback lure and a call-to-action for downloading content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 9

  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614457005c798---93313325467.pdf In PDF document text
    • http://dominoliberec.eu/images/file/files/tetife.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/15603532048.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/25835413149.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/68759861270.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/jewalemafimabexagusim.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/75758015339.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/silexuwilofox.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/vedilamuguvekupe.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/kinipul.pdfIn PDF document text
    • http://tano-cable.com/d/files/zekoganenimolasadobajup.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d614lrnv1c6ukh465r0r8lgsvb/56000684092.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/54103514873.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pufome.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135117886e90---newudetizavanixizuti.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jijetug.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/neniwofizekakuroxiriwuzup.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021939222.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/japodevokakolufidinuwunax.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/vuwuxitupepupa.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/furikikev.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/viterolekigesaxazizew.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/lojekufoteragez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+conjuring+3+online+subPDF 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_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 19252 bytes
SHA-256: 17c636097549fdac4fc4ee0e9cbab4b975decac4b75fea59e11850816d5c2a5b
font_02_sfnt_off0001510c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510C 10752 bytes
SHA-256: a8e574feff72996d3a864c89f670db4c723f9586a264c523689fc73c8c3877b4

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