Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf6f1e77cd9fa5a…

MALICIOUS

PDF

90.2 KB Created: 2021-06-13 21:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 19f81afc07df7c300a1d480497a9b9bb SHA-1: bcdf208c6b8ea0e2436c0ec2710d8229aaecf3e3 SHA-256: cbf6f1e77cd9fa5a800d2934f62a7d9dbb4009f7db9ab4d5d1cfcf4c724fd687
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=march+2017+us+sat+answers PDF link annotation
    • http://zabradli-znerezu.cz/userfiles/file/56958163533.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/86327dc03285bd70bfa8dc0632edaa5e/96241528679.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/gepelowi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b1f1625df48acc5a8d1c04f4a22a650e/15310384763.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fadb1a44f65c3d705137ed324f6b3600/nogawomofoloterif.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b113bdc48e570c24f6d2bb5654b62e69/16349624016.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/55463975971.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/re10dldpev9nnk2e4bh5dumg3u/53595405182.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/15636816057.pdfPDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077b69fb0849---pobeb.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/52562379898.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/67d857be15fe38f5d5255bcee75b1e25/31034724361.pdfIn PDF document text
    • http://tfforming.ru/d/files/72131179312.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/845899c508f803e29270f32866140f17/20671398775.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/84187767558.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/wuvepunire.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/gitebur.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e83068a4e302e1c5532538d5ef3d4d88/pepovidivikawejopuj.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
    • 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_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 5360 bytes
SHA-256: 646784e73d1e884c75231b3cc8c15ca96ccc7c08bb23ab5e787f5bd039343618
font_01_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 11364 bytes
SHA-256: 3d44f60d134e48b596d90bc696332bfec9c4abf7ae9959d2333c3cbc23e5fc0f
font_02_sfnt_off00013a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A90 19576 bytes
SHA-256: f86e558940647323f212e6a18b3b718ca61c69535ba2e10c6ff15d7fb0e50908

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