Malicious PDF — malware analysis report

Static analysis result for SHA-256 8322d88ce3f44c09…

MALICIOUS

PDF

107.4 KB Created: 2021-06-26 12:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a02b512ef365fffa18d4ce7af9ff787 SHA-1: e5247463c7c7d7db04f6d3f3ef39e2727a7a5270 SHA-256: 8322d88ce3f44c09141309f8aa3c2c9d05127bde0a9adf8c95dd035a1724b29a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3128e2cd8---tifekeramavabage.pdf
    • https://etonbio.com/newsLetters/images/file/suboxutunolepajuwe.pdf
    • http://consulcongress.it/uploads/assets/file/jojunisipomedanivopabat.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abce331d41---36088563581.pdf
    • https://alshaabcoop.com/userfiles/file/vadoruvetew.pdf
    • http://amexeuro.com/an3_Uploads/file/16754029611.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/prjsolcl8r3d8q0aatmt2h8mf2/68756735190.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce730151ee---pilirixupalejijifedaro.pdf
    • http://studiotrusso.it/userfiles/files/8629365645.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb240506c6---13935005168.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/42422104173.pdf
    • http://tencanpowder.com/d/files/safonazotunowafiwigubi.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c348eda20c901709df53a5b34361d318/75578081158.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d255dcf993cb04ed351b5237a9359113/nosixozepatukuxafaxodanu.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dsolm4i0hvinc8mbnfcmcn0gs/93070249498.pdf
    • https://secolink.sk/userfiles/file/82022567678.pdf
    • https://alianzatours.com/imagenes/file/26239078528.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa30d9e50---kegusijak.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328891517f---pavutesetaxozatejokefud.pdf
    • https://sayurmateng.com/contents//files/pijitox.pdf
    • http://stardentalcare.org/userfiles/file/teguwamezibidoxomoxulumi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rise+of+the+tomb+raider+challenges+geothermal+valley
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/45925d2de00468311873d20468e88d2f/56150883047.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013de5.bin
d442e0a57847f309e591142f93fc9b97bc341b3870012be1450a7fc0bc439001
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE5 18520 bytes
font_01_sfnt_off00016ddb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDB 16792 bytes
font_02_sfnt_off000185f2.bin
f6f5aba203534248dd209ffd2d2a51411f6acef8cc574aa68e9c322c1ad098da
pdf-font-stream PDF embedded font (sfnt) at offset 0x185F2 11288 bytes