Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e84dc3eaab42ce…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 04:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5896c6f1b69aa0a5dcf7693594f821bb SHA-1: f0743fad12865d2a35dd926bd22f157d0bf201d5 SHA-256: b1e84dc3eaab42ce8ec56c33d78b0c7e1cb3c3864aabe3b4b078206fecd0cfef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pesonabali.dswip.com/ci/userfiles/files/semaje.pdf In PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/gasosuvexopiboxijun.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65497325524.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/22799774613.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/xadenuxezuwobupazukafib.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/wumojafuwutawon.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/dexakiworagesizoje.pdfIn PDF document text
    • https://irantruck.ir/data/file/30292905100.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/43159579326.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/labawarav.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/merivajifamis.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/tofexelelofagotavetopu.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/vijekuruziwano.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ddca0edb---54256872419.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ea995bef8d212b034473bb571d848aab/61802719273.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/28008518303.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d635f6272d---65606685546.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/welomalosawadatetawupi.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b301b75d3e---98285867649.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613affa36921d---16917406380.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/62820046240.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/95250095903.pdfIn PDF document text
    • http://cityfate.com/files/files/48380739500.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345f475b438---jenedikuw.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/edde121f60c077c7c1f970b3f493be36/97965173269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=index+of+mad+men+season+1PDF 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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 17500 bytes
SHA-256: b2744fe9c8e60b90f88c351feb0815671814cc97cb677ebb8834d151bb2358b8
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 10284 bytes
SHA-256: d67e7f1803124e901f41b414bd3c318b510ac983986990e1c9dd274c3d9da2f2
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1