Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ca759eced4f7e0…

MALICIOUS

PDF

104.0 KB Created: 2021-08-19 18:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8906b7338975236cd34b884c30d6fad SHA-1: b1a7092ab84666a30b5309a064de240981409521 SHA-256: 49ca759eced4f7e02ec8dd2353214ae7635dc05c026d237bd4bfa45ba56558af
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0aad73479c1f0eef1c50a5ed7f532b56/bejazo.pdf In PDF document text
    • https://mokhalasati.com/userfiles/files/65463609361.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160894d055a1f1---ziwiletel.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fc202035444ca033a1c0b871f9764337/58413044387.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vj4i9au1i9pfb4tg9s25oommj9/62547027641.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/vixopizagovunalotamirezum.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/20ro1omgpbcedu2dcac1i3kijr/45740615182.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5280c693ac045b5bf811a45a4491b7a3/47043774940.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/zezelazovavusi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/47382123734.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/bemotufa.pdfIn PDF document text
    • http://apex-architect.ru/images/file/vawiwubowigejewunejivu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57f2bd882---nanewurem.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/deed9c1487cb4d0fca33fce76d62428b/xefawej.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/5949131319.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/kudovukonuku.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sunaxunemijatejasi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a7777a2eba2b647d36a9fd22fa3d5d94/79059773150.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/darasadu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a728b79c---vagebewo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/palubivofesibisu.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/47482329810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=diagrama+bimanual+ensamble+de+un+lapiceroPDF 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_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 11000 bytes
SHA-256: 66f0075dbd20338ef001b20b730babe6db5928aaec9cc12a243bfad8a70cbc39
font_01_sfnt_off000145f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F3 19340 bytes
SHA-256: cd893a45fb4a829f9c9cb26ce7df778a16b7b6a749a5583d4f50950ec749b37e
font_02_sfnt_off00017792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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