Malicious PDF — malware analysis report

Static analysis result for SHA-256 da74486f91da34cf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 22:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b513610ddf0383994f7bc77169716d9 SHA-1: 98cf685af03dea1f11a233cf31e08db7c0681c5a SHA-256: da74486f91da34cf1137567fbf7870a12de39f6353bebb095f902a147328f46c
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of a 'Password-protected archive handoff' lure suggests the user is expected to interact with a password-protected file, likely containing a payload. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://tochuchoinghi.org/files/39423935593.pdf In PDF document text
    • http://romangruszecki.com/uploaded/file/98826223795.pdfIn PDF document text
    • http://freewest.at/45240543385.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/xiwevuboverotom.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xilikabe.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/66459698292.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qvsj482qo8f8504461kjm2aoc4/xinimetupipugudameb.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219151844543845.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/31217d8cbb531f50c77de91e42811a3d/xitolixebe.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/91711677308.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2a4ea5db49b1202a4e46cc9af480ac4/19324740236.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/bifixenobariwenupala.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mujelokuzuf.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/dokalaliwuwiwigonagojul.pdfIn PDF document text
    • https://simorgh.it/uploads/file/dujudenofarezixeb.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/puzivejuvenelivosanawat.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394bfc5bc4b---85852740765.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/mumofibekuxumorit.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/22325678634.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/jirekogane.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/42679108423.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/xifivi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/422eabb0b4df2b0255795b80521bea03/begevule.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/23234705616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=video+from+android+to+pcPDF 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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 18612 bytes
SHA-256: 4e654bb49ce35a29672cc574efdf25bd73b91dd5b911f43b37eb4284a1eba8dc
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 10536 bytes
SHA-256: 1bcd0281582bebd6f914f3e73c3ebb58d5ad0b2ffe73b390711c2873a8bc2d85

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