Malicious PDF — malware analysis report

Static analysis result for SHA-256 a882142d0f13c2d3…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 22:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3eb0d12bbcb82df8d5b6d96540aa285a SHA-1: faf0450d5b161c97dc099e3734a1ed217ddeffb8 SHA-256: a882142d0f13c2d3fd63bc57db3ea0a83aee60fef1313412aa61cdf0c3480c7c
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. The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it is designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2a90bd8e4d493e4805301894ff4ba4a3/98947748153.pdf In PDF document text
    • https://mimpishio1.com/contents//files/81088242251.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/57902863204.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o56av58k08ui9cdjnri6iktcv0/10597815682.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/fodusu.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/36173501842.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i2vnr70qutkslk9se5dod98us2/tikanigugu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/zijijigi.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/891305115.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610973858fb8c---nemitabu.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/88120553147.pdfIn PDF document text
    • http://abnicum.ru/files/file/83880630670.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/b8ub2nk80il31iihpa9lp77184/5204445151.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b6irkav9t6kqdr6f9mji25a6mp/1770863228.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/23526205093.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc7289e7c---luladinevobowon.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/34541155805.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/45689041762.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606db4837b075---jizufibutamatigusolarozik.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078911c0340a---18993650109.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f12a36df1ddc0095c2450442c2d3f2e9/xaguzazobibebutebeba.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7123331df7---fimerukaj.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1c75a537---vatukalamogunejate.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd11b863d---54934977999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=braun+thermoscan+7+irt6520+manualPDF 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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 11240 bytes
SHA-256: 8b045ac6e6044ab13a13f90f78b3ee2a4739a614277cbadbbfdecc58293e3a35
font_02_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 17924 bytes
SHA-256: f8c41f2f4ebf0ee1628c10ef38e1abcb1dc414b3e536cbb172178f5445fa445c

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