Malicious PDF — malware analysis report

Static analysis result for SHA-256 f917b2ec3170563a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 15:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 753d977f0119c0552618beff3011b44f SHA-1: 17736f986d24aa0e7030927162dec2e1b0e8e22d SHA-256: f917b2ec3170563ad8d196f84aa6eac3ec49de13c43150879a00a3bda0c4c540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign, likely leveraging social engineering to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=18+cm+converted+into+inches PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cvab9f1ug3u464p5a3931ei5vc/23946873388.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e68b1bedec7acfd297abc324bd357702/86444534147.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/20880166179.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kcv80o0bsop1piuck3ho5tc1fa/zinetuwuvubixuputi.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/fojor.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d454b383bbf---55076830129.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd431ef72---volanejadamibo.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/div7ftummfvk3sfaa737gl6kig/xemanawonomad.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/37349688816.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c86ac797d06434d58ed8a165d3fb0f00/fifaponovopefow.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c921f28fa6a---33544543735.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2cecf9ced3972224ab81d4c743e75714/24583188975.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f7135486acc1c7f9db1a3ac483b65c67/62604287572.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/40d90a317dbc9131db645fd30498e6ad/tunuvotibazedukuruwefiwod.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/dunowajonemagijedapilev.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/79a5f23a584c3867a99634b945116d16/32968785506.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a5112ef3---44511769074.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1ce79ba7---zunemo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e000793b---wexobuno.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/93463508836.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/60692928218.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca56220b5daaae84157f0354b8aa3576/jereriwepipexalojirip.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ki5ase5mcv28q3rua1s7tlqdb0/1319387696.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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10656 bytes
SHA-256: fb30775c588c17e7a484acb92cb9eda4d6587405874022a097b29ccfeef43304
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 17072 bytes
SHA-256: 2fd7166c9b57b4f8141c66c50d1b0e8f7f949b47fd8aad0fd37af47b7805b732

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