Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16c2fabc1b46405…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 04:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37de281509b0d83e6c4bdb428dc94904 SHA-1: 7c44c04c811cc2bbdbb43344057853df18e6dade SHA-256: f16c2fabc1b464057b71caffc9b0eb9d636fbc88a963f01245b44edb85d1f9e1
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The 'Password-protected archive lure' heuristic indicates the document likely instructs users to decrypt a subsequent stage, a common tactic in phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tybistanbul.org/resimler/files/15125384444.pdf In PDF document text
    • https://toppelletmachine.com/d/files/39819867315.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kirofuzilowojiler.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://lionsmarsala.it/userfiles/files/luterip.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4262df256b6d1c43a5a0b06189573bde/53776053861.pdfIn PDF document text
    • https://gdaniec.com/upload/files/pamatuw.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395adeeba49---nasojuwifiki.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rukuzemiteguri.pdfIn PDF document text
    • http://sswjeans.com/files/11105390179.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/wezuvadovofiniwab.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/74422721053.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/pujebewitobojuriwekudi.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokutani.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tudirevoxegewotese.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/65389583588.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613793d14facf---visinaj.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/tatoruwolebomonero.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/60980641962.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/bolulomog.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/puwedovixedufasavavodam.pdfIn PDF document text
    • https://maisonforville.be/documents/file/48756448656.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210906182913.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/3357450172.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/97475099165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=idm+apk+for+windows+10PDF 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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 18068 bytes
SHA-256: 9ceae26e159fd490b5279abf1df9e7bd2054913ce515a4d0dc4b5ffda29d3486
font_01_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 10684 bytes
SHA-256: 7407ffbef8d12c25fd1edab45199981b36d6901d6cb470889ed70f120a97fdba

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