Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c40979a950e85c…

MALICIOUS

PDF

72.5 KB Created: 2021-06-19 19:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6d1074c503dc0317fcac128f001da240 SHA-1: 74927abd25125e5dafd89efdcb481837e188b7e4 SHA-256: c6c40979a950e85cfce8f4ab31d7447ff8703f1ce0cd3f30c4597d84a9e4d89c
216 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive recovery secrets or private keys from the user. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=tor+browser+download+for+chromebook PDF link annotation
    • http://usa-ex.com/tivujalo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609699b264945---86192233218.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e79c31154---bimuwagedupuzizuz.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/vufukavugavapapu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/10/file/20210510_170342_195.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jukonirulawiligel.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/nafusenapod.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/8589506373.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41cbd3e80b---tesavu.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/jinixolapasokaniso.pdfIn PDF document text
    • http://temple.mo/userfiles/file/10152711122.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc21ad3e8---42725693644.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/96311869354.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/48840356532.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082a63394723---93018080976.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pbu52oa1iu3caai1v4mshfirgd/rixuvoveresemudaxut.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210606_132800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 5508 bytes
SHA-256: 416ecabfac3ff05b882646a82004620764a41c0ea071e095283dd42c64e243fc
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10464 bytes
SHA-256: 45c2c5cd653d719b77f66e9aab2a73c29dffbb498db6087b68de69505ebd692b

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