Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a35389548e5928…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 08:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de854341a4fad100b3cb0fc86e7b5b68 SHA-1: a2da1a4db4072cfd8674cdc9309e49bc8599d1b9 SHA-256: 78a35389548e5928c29cbc261b775b7e124ae3f461b88df47fe42a3e05eacd3b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple external URIs and a link farm heuristic strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://nwatchonline.org/userfiles/file/25672312923.pdf In PDF document text
    • http://aaaexpressac.com/userfiles/file/kogizujomi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/iscbiv5d937eqcnembgjd0c8us/96926994143.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/bp6c0oe8mn0a7ioru19io9v785/22475148418.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ae7eadba---98866649302.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cac254067---30572165178.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/veribisozije.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a86f4d2fa7a---tusumitazevej.pdfIn PDF document text
    • http://ndt-ultratech.com/files/5945330386.pdfIn PDF document text
    • http://waypl.pl/upload/File/nusimefovonasugewijug.pdfIn PDF document text
    • http://18554080.com/userfiles/file/18587209460.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/20660507034.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c45244637---ruxil.pdfIn PDF document text
    • http://contactconfiance.com/files/files/kativepuxoj.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/9375657529.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/54218576336.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jisubude.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/guxejuwoseduwebezinurejo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ddcde192---rusamebopubosotipopabobe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jgbn30i12pdjvt6tg5j1ig4os5/52313464768.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5068cf49b4e871ade525a6ccadcb48b5/jarofi.pdfIn PDF document text
    • http://domplus.su/userfiles/files/xozumirerepelobusixiti.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3038d5c7e---wifiteretagefijamojiligob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=differentiation+division+rulePDF 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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 18660 bytes
SHA-256: 0ec9c857c0369d14f7bf3019ccb47875620404e07073cb6bd0ba38bfa49d9edb
font_01_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 10516 bytes
SHA-256: c492df6765b873a75d4ea023b1b90c5815d08ceffa99c33798fb2eee1c1148b6
font_02_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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