Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f96d61151c2eafe…

MALICIOUS

PDF

95.4 KB Created: 2021-07-31 10:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db127bae11fc028e6d73b2f7670d5611 SHA-1: 255149a1e70bcd8a06e52ef68dfde0fba37ade23 SHA-256: 1f96d61151c2eafe0eeea3d4b1aea62c870bf97c590704d3c56d31b7337274e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2ba7d3a6d9f81a7d1468c6a4827131c2/retelexosanebuvapi.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee45fa6158---3084956949.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/44666811632.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p5d7ocj5s99s8k9r8a6hrjk3ca/dolawokogajuxotaxij.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/lafujimadopizelonorofij.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c46b4b1c4e2e2489d7cd403820c31276/34022749597.pdfIn PDF document text
    • http://distributoram.com/files/file/59867032300.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/30029808057.pdfIn PDF document text
    • https://energooptima.hu/upload/File/vitenolidotelof.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/4009920385.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/zafekojokuv.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099522786420---82209720900.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/62548557958.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/tedofilagerakifudorulab.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/riromudorolezikukarakago.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/fewupazubalowemazuxaduded.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/0853dd75fd4aa1118b71db2046979d94/metawib.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/bedatebidi.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/64300243339.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6uubvdu9jj2lhuiv726u1vq392/dasoloxifanalepugalex.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fegenabekasijugifoj.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/29918991489.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/58652189887.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608296d554eab---fisapozoxodoxuzedugudawar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=national+ambient+air+quality+standards+india+2019+pdfPDF 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_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 16896 bytes
SHA-256: 616f063f7c14967885084b0a131c74fec68259ac43333c86218c71436ef62306
font_01_sfnt_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15445 11600 bytes
SHA-256: a19d3ad265d84bf9f5c55e6bbadddb7480bde745c83cdd844a53fe2cfdd460c2

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