Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cddbaaddd97067…

MALICIOUS

PDF

99.8 KB Created: 2021-08-21 03:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc5309394e4f5fbc1c846a00cee6a54d SHA-1: d405b8c4726b62d25706014f38c9c3f9ebb8d278 SHA-256: d5cddbaaddd970677adae2a70ea5f2c08ade8fe8b1b50f21f5ec5ca87188daed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=acoustic+blues+guitar+tabs+pdf PDF link annotation
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/68148915286.pdfIn PDF document text
    • https://davaocarrental.com/images/file/jibutorajanemodujizape.pdfIn PDF document text
    • http://halmar.info/userfiles/file/zikulefojanibivo.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210729215035_mm18zc.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/df1eb8a17805edc757a1f608c4f8fdde/wenuzisu.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/18026587843.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/gomomusepixisukegemokim.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/12732674346.pdfIn PDF document text
    • http://jngf.cn/files/file/99947695472.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/89807440436.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e204ba4a2f8805ed77d48f7103c09dc1/55961517504.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/7675709588.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/15980454626.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/xotimulibanop.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/26390772676.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/chr2a41ja9artepkd8iu5f19e9/jozudunoposurot.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/64056658146.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/gexovuzalaratetusevul.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vhkr62qk7drklshl9gk579cm32/54755640316.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/39224044e2baf681e4d6b2de1ca366c7/94047103936.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc079c89a7---mupikimib.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/muwevugupabaxofenefe.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10912 bytes
SHA-256: de2e83b0e7e4058c6d4369e21eb97a06598b88c5b56c546faf765ffe176dd8ce
font_01_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13954 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00014e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E95 18944 bytes
SHA-256: ade08c9561992bd37215e8bf980073517953e5af1714a8bffa2bc18eeb578559

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