Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93fc42ce64ec42c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 09:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0880842a96991794bd08742e3e068e3f SHA-1: 698d9e280eb2ff0ef55c5be6638ac87883b13695 SHA-256: b93fc42ce64ec42c04f23a92c38fe0175b753c3ed19cb0b102a887f3c7b009d2
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. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links and the PDF structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=law+of+diminishing+marginal+utility+example+with+graph+pdf PDF link annotation
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2938efb3d666c687b210d69b3e40b2f1/98593746775.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kizof.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/aa6fcc3fcd7fd97ec94d9720eb0f48b8/terorodifulivadolugigonim.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/labevewilimogegizibizeb.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/95543169611.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/sarazovaxume.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cab87190---42307638881.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/surakotegunelapopen.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5c3e38e4a1a53e51324a79e4ca8a2960/89705969333.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abe55b4255c---17708944329.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/nukonorifozefedesaxazaje.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f72733e9e286b2d19b5d82765400504b/26091361704.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bfb1580805303068872d0cebfdde5ca4/47466600188.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/efa36b9ab9492f30afdc53a563d6361e/85673997516.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/24102057025.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2nrjrqnqbuo019lnr7qenn35s4/sategewagunuxiva.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/516aa15f04005d68749917fad8d8dfc4/karevudilewezijotimul.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7dd88672a665cf040e43d5b0781e611/jowutaw.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3bc0ac225e64a04aa0538a99d0baa925/nimugonemegalarepikep.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fc5e8e76b7593b70660d24f18023ed9/86886152397.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96d5c5a65---16356475358.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/3043816531.pdfIn PDF document text
    • https://777mto.org/contents//files/mipasesisu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/81086281700.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_off0000bd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 11304 bytes
SHA-256: 956d20afe20d4f9c067ef3514e47e46ea1630fa885686fa04750c57038d2d74b
font_02_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 16468 bytes
SHA-256: a07a0c3b49ac7df77c8b6a4a9f30752ab3e406b3bb67d20086e917bc8728eb59

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