Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75d1cfbe118071f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 19:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0064148952bead89a753ffcb7b41097 SHA-1: 87651b8fd5250ca64904752109aa3ab9a5b7feb9 SHA-256: d75d1cfbe118071f59b99ca2e866b458123d28f3f613f3c3cae12a2e13b60bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.zochrot.org/ckfinder/userfiles/files/92101780216.pdf In PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210924121103.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/favisunuba.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e8a3ad71b7d0432f1fe1a113f634f58c/88209922062.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/88925219954.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451c4be5494---xitizadigewexigubuxuk.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/8096338499.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745acbae75---bonefaxetoxexikawaleduxaz.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/72510022427.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/fidafigawuka.pdfIn PDF document text
    • http://safarang.com/basefile/files/32566044788.pdfIn PDF document text
    • http://npas.ru/pic/file/38901538015.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/digudubunapokafuwo.pdfIn PDF document text
    • http://allier-genealogie.org/File:/dinoxudovo.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/jedakode.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ceb51ae1c---15263868656.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210920_221009.pdfIn PDF document text
    • http://yongqingtech.com/d/files/wixetozekerefijiredo.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/64081497343.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/nevimedadeliz.pdfIn PDF document text
    • http://dfanchem.com/upload/files/rabufojag.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/1734648817.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wijufinomafesubikamotosu.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/98604239286.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/bepipazumojaxebixijiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+video+to+music+converter+apkPDF 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_off0000b1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1ED 17368 bytes
SHA-256: feae7ed61f791b9ba0ddcfba9051e6f17ba26515ab3ba97523c2f9e94fb6f29a
font_01_sfnt_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 11020 bytes
SHA-256: de76b8ff0a18558a2e06b076f2d8c704a55dc1b1873090aa93c3ee406a3f40a8
font_02_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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