Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f667638d40a4169…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 09:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 662c6e0f366c5d8830f6eee199c605b7 SHA-1: fc264936a4034fe3add933256944f94e84f2899e SHA-256: 8f667638d40a4169e76b0748c4f14172d4059fdbabe976ff868a9b3ad75f0fe2
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. Multiple heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcc47b433---mawanopafawejuxizi.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/59465465037.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108042146422794.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/mobapobad.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e3c8d07a---31241559187.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607365a8ecb5d---21752649098.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790010da59b---57357822600.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/89734a5c39181ec0fcdcd3b0b0189b4f/wemukirofoburesemenosojof.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/fufarinamaw.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9d37e92a26bf004ff355f3407128de77/49599477441.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/95468413235.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/penuvaweg.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/30980393125.pdfIn PDF document text
    • https://comfort8889.com/upload/files/desalidena.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/63930604559.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16071c35e80e5f---60151244105.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a67bcfe6e---22558849646.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4d2324a488150879f33f3df2fe56013a/2083457068.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-12/20210812184711575542.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/54223270432.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/numajijulefivum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=penn+fishing+reel+repair+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_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 10688 bytes
SHA-256: 93bf44901748ea233c6c8d3aded59a4c7ea6e0a60df23077fb796990ed6c3566
font_02_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 17504 bytes
SHA-256: 3cc83ae20f3d1ea69aac235bc99ed16a3bf85702a2562fa363472bcd1790bfd9

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