Malicious PDF — malware analysis report

Static analysis result for SHA-256 373f3e2d02f0d6c0…

MALICIOUS

PDF

88.5 KB Created: 2021-08-04 10:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 863592d26db95e2c2bb8776e2f495007 SHA-1: 00c068e06547a40484dc3b527ce046d0796f680d SHA-256: 373f3e2d02f0d6c06a8434ada2f8adf251d02cfbb9a191e2aa83a409e4a642fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=what+is+the+difference+between+emotions+feelings+and+moods PDF link annotation
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608629c71a3e0---nenexiletokal.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/naligatipawuwidapodivu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/64ba5e49a0189d4dded5c5168760a472/zexazijiz.pdfIn PDF document text
    • https://mauspro.net/upload/files/87759037466.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0d8cba34fefa7b07b3b13c07da510f8a/piponatubun.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88cb13fa35---tevasuriwevo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610610379f5ef---79048838258.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewolazagalasumabek.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf0c7e3dc---42672908989.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee966891a---sawovo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e7e3418e07202c248f0de01ac2508fbc/15428862139.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/90508100609.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dozurujemasulopewujafuwod.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210620020607.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160815b9f0e296---bepatarawudigu.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/tudivowavoporajin.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/99312260552.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/lozuvatofupenolu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a06c066c563f8bc3bf3c56e096f8fa62/kupovasirek.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/70893492828.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/73684954977.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/3985042293.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/polif.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_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 17080 bytes
SHA-256: 4eda269e1dc1ca70096091cca71e197f3c289e9e54ce4775d074b2eed6bfe001
font_02_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 11144 bytes
SHA-256: 3dfb11fd1e8f2f99694148c38cd7fb28a8fef9e774bd471292ec3667bc56e7c1

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