Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec056ff095aa0e8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-28 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3698a1b3bbb207f98bb0b95b179fea4 SHA-1: f9ce17c60591f834cefa94c664411f77d3067be5 SHA-256: 2ec056ff095aa0e8ff7ba5d5889567f5322f48075cbe5cdf80b74a7b71aa0a17
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the true destination and leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161285a159bbfc---26917238844.pdf In PDF document text
    • https://espiber.cl/images/uploadedimages/file/bovejabojawemejima.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/35000128834.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/89031987220.pdfIn PDF document text
    • https://isosklo.cz/uploads/90362469034.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/24535048654.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/27952554349.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/11072665728.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/23031250436.pdfIn PDF document text
    • http://sivam.pl/files/file/jawaduw.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96bf5baef---puruvawuve.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/48291752027.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/45420201229.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1cb8e7e7---50414216371.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077f98d2dbf0---juxokufo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/985gjuptq209f82t4i86l4bl55/kinukukokefu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/beguvunu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bvt44ed8gmj0pco2oaufec1344/23687112622.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/18616197954.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/dikulifasavegitilafifiwo.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/lamagizama.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/41790253462.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/37505479628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=python+pdf+tutorial+for+beginnersPDF 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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 11132 bytes
SHA-256: bc00e1c0ed2eeb8a0f03b141c78cba42ff58335eb120578284328259043bc337
font_01_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 19456 bytes
SHA-256: 94744808e1ecf7d11bd6e55386f02dbe714cb219482d564451befa9b32e99d97
font_02_sfnt_off00013b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1