Malicious PDF — malware analysis report

Static analysis result for SHA-256 97386135554d64a3…

MALICIOUS

PDF

106.7 KB Created: 2021-07-13 09:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a180c2320d6258c8e7bbfc5b7959522 SHA-1: 2abde2365c6cd67256e340c424599f5a71f3f073 SHA-256: 97386135554d64a3ff1cf61d05a9646ca803fa946c21a086f5d3d09d66cb166f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=chromatography+types+techniques+and+methods+pdf PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4175eb3ea8---pigafavalelelona.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff4984399e---3374013200.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/72175101808.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4e2pakaoe9s6661a1ru45lb5sj/53112267314.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/libanuxadogonijasaxajuxew.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609123dbad697---xumuxigunigarederujim.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac22c6201f---97245076498.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d31ef84f375---54453635598.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60a0f7075e---mobunedu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/34da7e250d9703fc80e38ed5d505a6e7/gopofewixijiruzujalijelon.pdfIn PDF document text
    • https://arerp.kr/data/file///nixoxudomevekafof.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510010239.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/nodabevali.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/dilabudidug.pdfIn PDF document text
    • https://soechi.net/userfiles/file/vixobipanizu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g99v5eiahupe8sdl3vtfq8qcv0/6487300552.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7124200c---78730440175.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/pabafoxakafobagivelekifu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/28558800753.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/27173254885.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210619_2931BE845E525706.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C02 17900 bytes
SHA-256: e3b8558ff1ccbd90ad651b93d61f99878245a95c178424eaff1478fbc1fcbacb
font_01_sfnt_off00016afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18311 11412 bytes
SHA-256: d43e8a911a04bd1e3963fdf456f3dfe824c8ced6d778d65c87f84716361d05b8

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