Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbf230b298d0484…

MALICIOUS

PDF

101.8 KB Created: 2021-08-15 13:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e39c310185ae372067f5985b37a5a6e SHA-1: 475281e825b9d45420ec5f90c67c5edcec505e14 SHA-256: afbf230b298d04842b30dada79c2576e5a3498e5f64be0fafeb12db42dde4179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the PDF and the associated URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=plantillas+de+escritura+braille PDF link annotation
    • https://noriupapildu.lt/ckfinder/userfiles/files/gedusipifit.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/21584732996.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3848395be2a711a62a87f1bf9c5ef36e/37722086580.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d516d08bb77348e5fac8e16da062dd77/pomigewurijojosowo.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/74732245273.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/77045367186.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/lozudoruxis.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160caff2cba63d---29041258716.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160838ce4e7b01---54918424902.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6050a1594c---25854336564.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/3818961ff4d889739fb6603e730c5803/42121561630.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/557383d02374bc9473b9c806c316f73c/4763179292.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0e8aab2842bbe6b676a264b0ccf4fbd0/dagewikelibi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081570f28a3a---latajaxa.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/67883715807.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/44342678402.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0c2742a9---xejukewokolitisoxolema.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210712_0BB45CF31312DFE3.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l9l0nbg2sllmlim7bu0tnvnom/sejuvulegekabozofipumexi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/15370090925.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113641d080e3---judakoxovofejijiledivi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/mivorazuxobaxivixefeka.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/24560320565.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/sbftb0prlfuaf77oim73l9bgs3/vozedegowu.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/22470809565.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 16136 bytes
SHA-256: 8226e1194416575d4dfb473416c5443f51c99fc023abb92df21ee1a55dfcedc7
font_01_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 10484 bytes
SHA-256: bd98c30fb309252db196ff9af8523038cea071c822d12b93a4c9831a1f154aa6
font_02_sfnt_off00013744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 27436 bytes
SHA-256: 75a1ca6ee0b85ccc1ea20a20473fef3f1bf8085ee3a38e8b470a58a2ef535064
font_03_sfnt_off00016f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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