Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e3ea2b031afced…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 10:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df9c51e18f51ec7e2b6a9565b660ed3b SHA-1: 51f24649c0735fbd173e8865d799f8be1cc4cde0 SHA-256: f1e3ea2b031afced84730741cd79f25b93a8e3985218b0c97b51d8d9a140b493
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on compromised CMS uploads or disposable domains, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=hawk+eyes+mihawk+manual PDF link annotation
    • http://sosnovgeo.ru/userfiles/file/15864178915.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/85324117505.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6f7a9026658190498b86d9bf39192485/tudiduso.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/iopu0q94eeot0v7efivheij6em/ponotuvasasupodix.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j8okdnnl9gnifshj93s2m528n0/muvem.pdfIn PDF document text
    • https://ekransamara.ru/files/79211499088.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/38452665717.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/bovesodip.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdf1a2316---67496936841.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pakubefaniri.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/12139993144.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/577882965.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-17/images/files/17203334861.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d5eead3fe9a47bad17b5395ec8ed04b7/borigupit.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926d3475fc---72583487797.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/revuvajenapudobobed.pdfIn PDF document text
    • http://alkanboya.com/files/file///duwufowoxewixonufadagod.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/wadotosefoseno.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a775e3513---70527559587.pdfIn PDF document text
    • https://aashianarealty.com/file/1082157642.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d4736b11520e4ddc89155cafc2dbbb59/begumaxaranexagutup.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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 20920 bytes
SHA-256: 6dcc67eb865fb837cd60a1d16543a567c5c0644f9819babe5aa27e2c37efebdb
font_01_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001411f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 10436 bytes
SHA-256: e6385b247f1a7a7a0715cbe99af284fdc896411156c4d776482a7c0d7d513119

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