Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b159a15a1ef0d6e…

MALICIOUS

PDF

92.1 KB Created: 2021-09-03 01:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dfaf101f20020a7af6543957bdc7f62e SHA-1: d5ce5dcd44be9552749c489422a50d863cc3a53b SHA-256: 1b159a15a1ef0d6eaeec519998584208a3c2096247033bdc80d47c8305eb461e
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a potential phishing or scam pretext, although the document body is heavily obfuscated and does not provide direct textual evidence of this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nemochem.cn/upload/files/wawogemojafigarugiv.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2d17a825d1c84d9cdc2e96f1e3296028/laxejekijuteka.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/su2u6un8eifku6luq3lu980dp0/16891717723.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/72271895776.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/30968499477.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/4353044408.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xufumatejanugutegagena.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/99591709084.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bd906f68d4b---29582736118.pdfIn PDF document text
    • http://ippon.lv/uploads/File/linajovirane.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210620_26B779879F5B2BEF.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085514d89d70---80763268145.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/gijiwazitawixusuj.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xejawugumimogiba.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/806e5b5182e5d3d29742f90d03e97d53/57879000028.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6ec671bc813d0a9b78725823fb9d67e1/meremejaduzutizefanudukoz.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/37296673944.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2dee817d6---dipazisukulurigo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pgh93hrmmalmqnenc1pru12l61/1902406839.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cjv030ccr54sanp191ejjis7i6/witosisepifunoxuputike.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161114e2f29cc1---gozol.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/wovefaworifasamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=beko+tumble+dryer+drvs62w+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 18852 bytes
SHA-256: 5c8d6a3114c8e01309f632e826ff4ccb63981ee102faf7b8bf6d81e9d5bb986d
font_02_sfnt_off000148a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A4 11256 bytes
SHA-256: 321fd51aca9f427e9816373907f170e57aa8c9720be6719d5291fdc828fa9cf3

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