Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75b8dac021fafbc…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 09:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 160e40eefd62c26da7e5f7d5577916f2 SHA-1: a6297355e56856ad38b85a238cf1a336b9c0d998 SHA-256: a75b8dac021fafbcd77107f225eb91db7eedc25c5b9e0881708f65c50feb46d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are confirmed benign, are part of a larger pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cobmedia.hu/include/64295852362.pdf In PDF document text
    • https://grandhotelushba.com/userfiles/file/fanub.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/mimasuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbb08835a8---nizedivugorulo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/fuwuvugowajiv.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160efef4c994a1---zusexupakeximuroji.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070411a3c65e---mekebiwarotepagugipagoji.pdfIn PDF document text
    • http://nessium.net/userfiles/file/jonukiju.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/3153912439.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a995d5bf08b---popebozubonebidokigow.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/29551752592.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/44358531468.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/zuwiloz.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/30366421685.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/lupekefeseveruboki.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/dokeduvekobufax.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/35282858974.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/lelevuweki.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/fokevikobutosinub.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/89342284157.pdfIn PDF document text
    • http://robbes.nl/media/files/32530435829.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/76308941059.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/832bc7b385968778fab9711c6679e94c/xikilugesibu.pdfIn PDF document text
    • http://altinay-law.com/images/file/xerefirepawas.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kgf9vs51oge9nskigr2v9djap2/sepataxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=old+testament+prophets+pdfPDF 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_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 18144 bytes
SHA-256: b19b1ff40046b2bfbfb6bcaf74d692ccb7fefa42ffb7f408c81f1b22f3edc745
font_02_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 10696 bytes
SHA-256: 1398370294fe17cd33b4dafaebb7c1b3f526c56a59fb7fe97577c1ba6ae7af40

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