Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f8cbdd38633bf2…

MALICIOUS

PDF

70.0 KB Created: 2021-05-30 19:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c0bc5360315c778da5f9da980868aef SHA-1: 43c5b17c573b4aa4e96337b1ba7bd98edeedd73f SHA-256: 70f8cbdd38633bf2489b24c3d716d5e60fab3aaafd56a45d96bb25699b069537
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains a lure for 'Adobe Acrobat XI Pro serial number hack' and multiple links to potentially compromised WordPress sites hosting PDF files, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://bestapp4u.com/admin/uploadedfiles/file/taragifaku.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/eaf4964467f0607ba92ca9d59f46bacf/vamosibivulelubamoset.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9804405644---82133496540.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/40240884296.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/7527140661.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfdb4b829d---sebowomunalefosudaxedu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/noloxajururik.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/00c7b75e7df37bcb799528aa0264b83e/93018458118.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48b8d0b3---nenofelofizemagutaxu.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7c05bbb287fb6210223bf6752c5250a7/66320140031.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/544a0ca4c6b9159723e1e785f4d55cde/27649741225.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160943a1e356e1---88823205396.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210531002151.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/u6d889mvk60ph53bq938rd6e9p/62374748061.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1nps99j5sjek42qptqf9vn1aa5/xoxijumopelugogo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/oschd4qukk4gt7p1cdvkurmcls/mutodelagofavasin.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3461e2863d---59623705171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=adobe+acrobat+xi+pro+serial+number+hackPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 5576 bytes
SHA-256: 03ed95893f458562e1adb82f9aa1302b87d40abefad93e72c2c6cd401fbf1914
font_01_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 11024 bytes
SHA-256: 6780d4c13dc686e567345a145ad8fb375f05a0968947063d56e74d33ea01e4f9

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