Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1f318213427baf…

MALICIOUS

PDF

187.4 KB Created: 2021-06-15 11:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 78f01d5216165e4fafad5d01b8af1bde SHA-1: 815b7d4a65ee628ff80487579b5df58fc7c3bbd1 SHA-256: 4a1f318213427baf070cb626b2e03b6c471a32cc7a15c746039895388bf0b4e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=converse+inverse+contrapositive+worksheet+pdf PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4ofqoch47t7156uj74dq05qa0e/84428313988.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d3d8c583950d77ab099535ee025398f7/xuvimanaz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f9b07528fa9d904f5fb3b3737eab5ef3/86276226220.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/61634005010.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/1611641941.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/96460754336.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707cde0b7b4---japogepajabu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0daed6a4da---zinor.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092089c2bfa6---vadorosopibokesowik.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/14721132735.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0addd314b5232a8a3f3ab49dac0dcc96/89548506787.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/im2et2md65iujqvlv3ri2679d3/xeboxefuweduriguketibiwi.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/55506980136.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf753cc4c---65741944026.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/k2r55gi0g65rtoro77n862rdt1/tazeti.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be621c1cdae---71909995459.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/67102504065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000286ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x286EE 5332 bytes
SHA-256: 87ad4537d3b2fa8effd475d32b7681390f7aefde2ab2ec85eb48c93fc0017ae1
font_01_sfnt_off00029922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29922 13660 bytes
SHA-256: c33f3981834f3fd3409b72d632bef2f34ec396cc6a5a2e921d279666285a2461
font_02_sfnt_off0002c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6E4 16460 bytes
SHA-256: 5c90c282298f5f04f3ccae0c03abb166c7f9cc73e891defa49cd325fd0dd9217

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