Malicious PDF — malware analysis report

Static analysis result for SHA-256 5844aee70c532e59…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 00:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1584b11bb452c0eb979bf1c404941cf SHA-1: f12c8ec46d70f545c181328c87c56129fc704246 SHA-256: 5844aee70c532e593ba2f872df537ee82076484d46f32cf0ffbe0ef94f3c40c9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and compromised CMS links strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=vgg+architecture+pdf PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebe627162---47727672385.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/77607343901.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d51316c06---12551467998.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/6825626150.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1aa883f727---23998293462.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f995ceb4de0536b3f5da4d109ef688d5/xebigisibopabaz.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/370b7068dead1dc08716fe3b1f2f2798/xeverojuniwitirex.pdfIn PDF document text
    • http://ashioke.com/images/library/File/37477092563.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/83064537900.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/fibabizodagofexof.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/49e20dfc94323e0e0991ae00ad23fd19/84065857693.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/hjk97m8g1a839d848arkofgaf7/30455886743.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/zedexitesotabitum.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a07d5c34c---japexugaravewidojuwes.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b608caf5---somerafijomowore.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/152438a8183b8eff06247606bb0eae83/83548747009.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/bupiketaj.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6d317d250---82867341846.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b3ef66dac515f678b51fb9ee2d4a214/37412732431.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/51852736794.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/84544309835.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007dd50584---jewabekejuku.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/96204049195.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 18564 bytes
SHA-256: 450961bcf63ebd409cd40f2b67f192a377a480c6ca97b43d453e26c58401dc64
font_01_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 10528 bytes
SHA-256: d09c8af85444d1746131d0bcc965b6ebd7aaaf5bfcb0a615d72e04bdc3583e9e

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