Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0870edf1c1e878…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 11:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fdeb38c61ffd0f1f4f66136406993a5 SHA-1: 5509fe763c40a7d1ef60b1cc5053c4d807eb00e3 SHA-256: 6c0870edf1c1e87871e8ee07f57478b06b20b35a6b3eab218deced2e6753b5aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=tecan+evo+150+user+manual PDF link annotation
    • http://immopolignano.lu/images/lexonoriwarititad.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91d575e8b4---52792399244.pdfIn PDF document text
    • https://dintek.eu/uploads/file/17257647615.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/05ad6a4c5a316afcd49948f49173f7cc/26188179229.pdfIn PDF document text
    • http://sooclose.eu/upload/File/70641343903.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16108bc1edd754---22074616016.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/mipufazanadazubisoga.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-30/20210830130529239708.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f0a75370---37838277662.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210716_D2FFAB7A8BB56254.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160737cf20d7de---pedefatijozejis.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///55995913889.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c30b72286de6970e516dc0ae187afdb8/24452076653.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/19729326129.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/19274371372.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/6786156053.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/6272360962.pdfIn PDF document text
    • http://unseretochter.ch/images/file/novagobokowid.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608872b05d0f7---wakigefebodozifibenufivef.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210805_111910_4705.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31c67b2dc---55702726467.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/biwibomowedox.pdfIn PDF document text
    • http://aps-mes.com/files/file/12518327129.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_off0000c402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 17436 bytes
SHA-256: 575faeccaa9d37d335d8d73088a1dbee2bf5db4d10febc84086f04adf5336dea
font_02_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 10636 bytes
SHA-256: b697d65a543b8961a242203db3c220f8f8a811d04106d4bd2f685806a9c6cc31

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