Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bec75a90887bb62…

MALICIOUS

PDF

109.6 KB Created: 2021-09-08 12:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9b4ee4ca70745dff62bed09c52d428e SHA-1: 31d87122c36c6eb2358a867d1b942595e13caea0 SHA-256: 3bec75a90887bb6235af4a30d7402c4cbbbb6637954df2aab3629f6c0635a19f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://badrivishal.com/media/76861330081.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1a576bd55---xugisefogo.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/90960499478.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/87111437229.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/taguveju.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4904e4e8a8bc7c6a932d71331d799d39/56104235790.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/93100170043.pdfIn PDF document text
    • https://fratellifurloni.it/file/xixosuboda.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/22927946782.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6c086adbdccf549dfd05c45f46e799de/2534337479.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609921ead89e1---76385383454.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/34976473629.pdfIn PDF document text
    • http://fygl.net/uploads/file/020010455506.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/97336650569.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb9cf80321---45963812243.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1aba6078e---28563613664.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3d382a7e99d854a7caa1cd6e24be2ee7/sawinafiluvuzifada.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e474pi5mehl1pask5seshlphh3/97767064923.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7044386a97127625404aad2a9fade57b/gokilunaxigebetixegenofo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4c469dca0d698366ba39d732a6a55a05/namovupux.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/42060152989.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/g61flnusulnth6mu2v18feehk2/fadizuxetimomunumenebuni.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2aa3d8d09---kokevuxogozipavo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef5664455d7d3a499e576e9fe11ca9f6/32671483412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=edmund+leach+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_off000148d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 10392 bytes
SHA-256: 667012fea677c90cb31c98d1dd9ee2bf70fb0b12715d7194633c816ed6bcea37
font_02_sfnt_off00017820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17820 18740 bytes
SHA-256: 41740ec6b09c0947f8918f07fdaa0c899c55e0134a2250c1f091e89d5f2592d1

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