Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6004d636c4c9fca…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 03:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cc891d757c1116aa165a3f7b64aeeeb SHA-1: 80c3ef95daa0b6f49a35ba71d961d15e560910b6 SHA-256: e6004d636c4c9fca71a1a9985ce5732456811e8c5d6ffcb4855d3eaf1a5be57d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable hosting and potentially compromised CMS upload storage. The embedded URLs and the overall structure suggest an attempt to direct users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://es21sys.com/userfiles/file/4461279486.pdf In PDF document text
    • http://auto-spec.ca/fck/file/rinigidivitoxiduve.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/22665764473.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/13373476424.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/18197305571.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c1ae25b247b8ae459e34d4be2100da73/82804660000.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/dujijibi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3914111d1ce4f842dc39ef1b74b93c5/fenosofimaresujugewapi.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/48125483522.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/burupexujudaforu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/mofutisevekajuv.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/43678209932.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/28386987746.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/fakolofizibatopove.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/raboroli.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/19531737877.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/sefifoluniz.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090505031162.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918dab638b---80047349713.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/71436644896.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/dovurofupoxuganowipuvifel.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/kifalodima.pdfIn PDF document text
    • http://orenprom.com/img/account/file/14750389168.pdfIn PDF document text
    • http://entrackintl.com/uploads/34481009231.pdfIn PDF document text
    • https://lesura.net/userfiles/file/81530133376.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/getadawuj.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/7708429963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ready+player+one+online+freePDF 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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 10384 bytes
SHA-256: 35b4801cea03a648b821b06f2e5eae5fde04f890fbadd22f2e60ef405fb2985d
font_01_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 18816 bytes
SHA-256: 4ec64b82940373e3aa6ad7e79d3de81a86ccf2d39515a30692b828248f51c7a1
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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