Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb7f6b4babc6e4c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 03:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c6b9c82d9b57f272e07cee91f67f74f SHA-1: 0eca910be5a54069274136178583970c83f6b880 SHA-256: 1cb7f6b4babc6e4cbf4f72c96f89b66e58abba8464a1b7d67addbf11a12dcdca
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised websites, likely designed to trick users into downloading malicious files or visiting phishing sites. The presence of these links suggests an attempt to deliver a second-stage payload or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/85969377278.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b9d43d941---sokini.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/64005043909.pdfIn PDF document text
    • http://dzbnf.com/upload/file///46468692507.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc057cd94d---28119912171.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d23eaf8cd---pujokolomagilune.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pumazar.pdfIn PDF document text
    • https://okazionche.com/files/funulixokataratuwijupefu.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/52296963618.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/55a5ae4118a44c0bb78c8892e38ed30b/gitevekaluruxumuwitagaxam.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7f6e0147089a2a959d35b46279413ae1/gufenuvisunupukukatamex.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/nbcdrr7rl11s22qodi04oo8lqm/12693755541.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/usn3vpkb8e40l7q40ievh62k2m/vexalojarokofaxutipanol.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/69254170538.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2fa66751---pemosodejofenemobegid.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5301722ee---1593920812.pdfIn PDF document text
    • http://gzwep.com/img/file/20218261354.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/55852899445.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/63600978296.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/sirovenitofupareke.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b71594b95---94049110099.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210722224126_zrccu0.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d615b91c7c---xetesovodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=partitioning+numbers+in+different+ways+worksheet+year+4PDF 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_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 18732 bytes
SHA-256: fb76e148950127a9e40b36705302989f9fb9d507fa3e5483d84d5f40c1a80ecf
font_01_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 11368 bytes
SHA-256: 3e141bfb2057e0b2cddf6e32b0848b5f2374e7f66dd8ba42c551faedc671f5ad

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