Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f51e5c90015752…

MALICIOUS

PDF

106.4 KB Created: 2021-07-06 06:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fef85316725d4d754f75ee9281c30765 SHA-1: b9ce2304ccfd29b3929a9a0578e73c7777c9d585 SHA-256: a0f51e5c90015752a04e01945434b228438d6823c4d5f93b8c752fd763363749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://wastran.ru/uplcv?utm_term=due+to+safety+precautions
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5a32097c---kotegegopujovopumakimen.pdf
    • http://esistore.de/userfiles/file/wafibesajatofinitogo.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/202ca883378c3fc187f11c17c969dd40/vuxakaxalilosinurubum.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0bce7d0b3a337ec2448be1b76fa56176/46531016400.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jp7mavfdjk80mfj2ala47vndnk/rawagapexatoniru.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a221bd1a250---tusalamajumoxifate.pdf
    • http://esejsc.com/upload/files/dojagasotasajisipujaj.pdf
    • https://bandai-k.com/userfiles/file/90443537740.pdf
    • https://hmanagement.net/userfiles/file/bezagafidar.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd9811f57---49534112582.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c6d7f8154c611e75de3a395d94cdfba3/41095256152.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e003bd65---jemajagokafavovuxab.pdf
    • http://photou.cc//ckfinder/userfiles/files/winumofirelulogoj.pdf
    • http://autohondl.cz/userfiles/file/gesanesonit.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f86274e7---85879868517.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4icgek8pic8i5u6q3bt4nc7prn/dipuwepa.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7vploqm3a93esk23pqpeio74u0/jozudurit.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e91348cb---30069932461.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/31467731732.pdf
    • http://inlovehuahin.com/file_media/file_image/file/larijafetujudawuwudufu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ivqcf3t6qf15vu0gs7pomf1bu1/79224314204.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf5111b1f---tojilimogolazozoj.pdf
    • http://almar-bus.pl/userfiles/file/73367417223.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ab693912---87103600653.pdf
    • http://goldnumber.info/userfiles/file/69690865400.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_off00013f1a.bin
1adde836d8ec58bd0bf92fe1afa537b5bef913dfef2b2a03efdc25a7a532bc4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1A 17112 bytes
font_01_sfnt_off00016ba2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA2 16792 bytes
font_02_sfnt_off000183b9.bin
930e3469ba7a64ef1f4d25f2d53bcef4be83c1939f967cd6734e535812399096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183B9 10644 bytes

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