Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d8c78033dc2067…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 01:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7c1b638baa5605d1b723be69284e07b SHA-1: 35e2c73ee435c0d482808eafed45a5b9da5f2251 SHA-256: 86d8c78033dc2067a5f98b31ee2e635ae9386186968dcabc9a27344e11b5cc68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/eb86ed0c59a30c8eef7cfba2635231ed/datinodewafav.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/83805070699.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cfc00d7e---10374764411.pdf
    • http://erdivigado.hu/userkepek/file/92990982953.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/373fb6ed944139bf1da460d3cf55a76c/fadipesoranoroguxopojug.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078166933409---sutuselupusabetob.pdf
    • http://sfera-vlad.ru/img/file/8083162901.pdf
    • https://rosycaffe.com/file/79282678230.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7610c1b33---fewabida.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/601e85adc8c1ef14bf59883077341003/nadosokosilimig.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c787d6d8---mixumipalasup.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747ffc10b11---71223379321.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/113f46a56b8f475ee278029c5fb5b8c4/33423118314.pdf
    • http://amoy-art.com/Upload/file/gipizasemugefukaridiganav.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097718d6b17b---pirob.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/86826615410.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087237accf8d---2331055929.pdf
    • http://softwarefactory.nl/images/file/17932504207.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p9bapovtdimprbc5gd4r8hi9s1/kisipilijilipataz.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160723568aec22---roxuzejikowakovelopedi.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6daed95971---bitutewowu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=executor+and+trustee
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6e.bin
3becd81261f9d6568c21eed6d46f942706c79762b43039c3ecba142695ef7df0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 16468 bytes
font_01_sfnt_off00011902.bin
cd634e59f60dc7b14a2f300a0c76b13b9d31b4ba2aa722d9f138d0a9dd654097
pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 10412 bytes
font_02_sfnt_off000130c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 16792 bytes