Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bb74e8741103fd…

MALICIOUS

PDF

110.1 KB Created: 2021-09-05 19:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7dfe34bbe5e229181b75d4d25bf93e76 SHA-1: 231b2afd17e989e0f3a2cf48727c1013a18bd66d SHA-256: d1bb74e8741103fdaae7963fde1f8b9f33a5890102b48be2a98d0a2b97db03d0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://maxflowfans.com/userfiles/file/3079836006.pdf In PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/kipilebamixasujabonimev.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/25cc3a0091a7a893000186674ffc8cbf/84827332524.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9a22bd4ce---86481114011.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/34bc75baf78412aee3553606694e1285/19868109188.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kezimajijot.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be41ae23ce---89521106146.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/gedexuv.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a4e5db16---43123358927.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/cde03b8c4a81d5e1a16b8673e2a1f92a/99776404098.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zufaderijot.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/n85v130vfabop8d7qa3sd6hrm0/41948987978.pdfIn PDF document text
    • http://getvisa.ru/images/File/31305252073.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lupajobenokimegoto.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/76029054855.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ecc38b5a---tibutofezolutorekagiza.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/zuwanagomanexoxalafixira.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8d532633706f70d2ca2449c46c1dd448/vozomifi.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/840417856.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43df1c0ec---ritebitaf.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/47323003389.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b897d5a1bc2---mamiberugogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=arquitectura+definicion+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_off00014214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A26 21644 bytes
SHA-256: f77113a38124dc8787503ccaaa795248194088ab850b3a2d59c73a0e72c2bd5c
font_02_sfnt_off00019290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19290 10628 bytes
SHA-256: 9b0a0bf1ca0072569116886cd980aa2bcea41f834efa1a0bbe20c566a288318b

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