Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b7073645a1033e…

MALICIOUS

PDF

99.7 KB Created: 2021-06-27 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b01c5fdb57fc89dea3d57dbc1818a001 SHA-1: 62fa7c9bc6248600b1c6d88190a8f5b26fb8caac SHA-256: a0b7073645a1033e0769c6e75d2b3af1d0c5c0f761decc99a170b38ec6f392f3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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 http://chromowane.com/userfiles/file/36933035255.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/742fb16fa84fee2bc0169dce4258f60d/gupibevurapomoravodadini.pdf
    • http://sity-luxe.ru/userfiles/file/kotikifiwa.pdf
    • https://moto-trend.cz/public/files/fck/file/golonamajikoluzogined.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97ee08771---3711880836.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d68dddcc---gasukerubamopigox.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/8ce5fff0dad630230e317182aad490ce/32668480992.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0lfglsfp2bppj24gdqtg21arrk/20661521604.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c8378d3e---66557401000.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1655c066---35084855635.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e73d6fafe803a8c06c2649e3ddc4c8e4/depexema.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e51f6e1809d9fa494dbd8fc5c0f68d8f/7088605335.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc5caa8c8b---diwilafisokawikox.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4c6b7a14aad46b5d0fe36472cef3551e/32635670503.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb89c72957---49122927209.pdf
    • https://victorybear-info.com/userfiles/files/61496728615.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b31c1846c---jogapulod.pdf
    • http://digifast.cz/userfiles/46542991305.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8043f3fad0d274380215643c7984c81f/perasuder.pdf
    • https://equator-maritime.com/userfiles/file/labejugile.pdf
    • http://staractivecollection.com/resimler/site/files/51697072084.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1b427dc724b720185e239f11b7bda2ba/duraduzewuzifivagejubuj.pdf
    • http://dentherapia.hu/files/file/wemorogifedafasuxabujode.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pivotal+in+a+sentence
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec1.bin
a40edf7792a826686e8a98202ea5577d34d011e9bf69663e61ddb9df4d8ec38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 20712 bytes
font_01_sfnt_off000121d8.bin
cc469a0b6309013b6c91dad82b5267dee20158d4487dfa6ed1aeb222a222c355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 16028 bytes
font_02_sfnt_off0001522e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1522E 16792 bytes
font_03_sfnt_off00016a45.bin
1f8c9b1ccd0ec8a747232ffdc80b4be6b82a60a35781df1be0ca71f19bcdb8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A45 10188 bytes

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