Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e46e202c9636cd8…

MALICIOUS

PDF

95.9 KB Created: 2021-07-30 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f35e1ba5fccd4ad916a919af7b71c73 SHA-1: 7e153d08744cc911dd7cc4bf47179fb215399b47 SHA-256: 5e46e202c9636cd89ea55cba7d6a43859f61074a173767cece43af6fc70aeb42
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the presence of link farms and compromised upload URLs strongly points to a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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=ibrahim+y%C3%BCksel+otomatik+kontrol+pdf+indir PDF link annotation
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d177ae34---42850729600.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qqhe54qsdg9ga1bsp8qlosg9hh/xuruxa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d9fde5d3f5549ce21e27910ec7d3eccc/fasiwokitixuj.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/jakaruzafodapi.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/57252387223.pdfIn PDF document text
    • http://adveotec.com/img/file/wupasarisifelenulalit.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff42c6aff1---40716310129.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e08b391e---83573471491.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/30367417641.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/13158707250.pdfIn PDF document text
    • http://primaneighbors.com/userimages/dumapawunuguxakal.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nubowafupovujifabi.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/25921404198.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/jigufixug.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/fegikazunuratopom.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/mexawosivonagizotofod.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/nafuti.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf59e74d28---39080602433.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/bikifudageb.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/xonawowe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ce4e3b24---62900770124.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918f742d27a.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/38999849893.pdfIn 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://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_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 11252 bytes
SHA-256: 39704996f1b079d6d2f1d6aca5d5a41b8ef219b8edebd0212b37e6ffefd509ce
font_01_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF2 19136 bytes
SHA-256: d334652cedcb2629da7249bd6ca68be991b7940125faf0420ae8616e159e1981

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