Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac2aa747d3c0325…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 22:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 672cfa3b7bcc4d90e882ebcd06d5f6e9 SHA-1: 979e717e680ee3db71fcc17991d3bc4c3b022e26 SHA-256: 1ac2aa747d3c0325e97c7b38d5e65f5d1ab242126e29eff11f7d92d73bea28cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=toefl+exam+practice+test+pdf PDF link annotation
    • https://fairtradeportal.pl/userfiles/file/nudisigunefusizenizamuko.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a40797b2b8fa73c1fcc5ceb9df91463c/fufomofewi.pdfIn PDF document text
    • http://babamoleskine.com/files/file/rupavopedupoviriweduko.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6d501ba61cdcbad9378e182f95c390f/56120525311.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b57ec24dd3351a14daf44a287dd6fe4c/nodilifaludusabobaga.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/79dded00719795a4d2afffd95e92c99b/vekeguzevifisagilup.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/69915086328.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/davugemuvibupiwekela.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/19057338066.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/favedamaxifaxubolulo.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/dujatakanapadoga.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eavljrt4pt37df26s36t9f1v1p/20385054374.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210605_A5F6F148C4E4A0C9.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5a8bea48663e3664187f7cc18c325471/witajekevinom.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/7796210363.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84681c5d88---masez.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089ddcd54861---fuputazejidumawupoga.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/fuximuwixe.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40171753301.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/tiwuserokajafovalarutew.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/72891945011.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/12677532742.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6eebecc749---laxofoba.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607911a4abfbf---59062536083.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c468b65efa0---duxefigewef.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 10740 bytes
SHA-256: 61e967bfd6bf2d4878bf9b0295e7a940da6928d4e10165ecd2121a4573e9fccc
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17756 bytes
SHA-256: 8ac47177961df9431efad4e8f4dfc456bf7f23be137248a88500327c48f65069
font_02_sfnt_off00012d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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