Malicious PDF — malware analysis report

Static analysis result for SHA-256 a232395eca5a3465…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 00:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a748fbf8b2a901f2cc91083b5fcb9443 SHA-1: d73cf933ed7f926adc0713b66f1e59a57b3a6d67 SHA-256: a232395eca5a3465739ebbad0fca732bbb2698b33198e1607e9e788c32574773
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. These links are designed to redirect users to potentially malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The presence of a link farm on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=cooking+recipes+in+tamil+pdf PDF link annotation
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a4e7ddfc---34891873018.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/tugifegotilevuzemir.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wotilifitugimesalaj.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/petawebapebenilufuwuma.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/pudomerejogemexenenu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rimakodiwuzazozanileweti.pdfIn PDF document text
    • https://o-dance.com/upload/files/zamomogogig.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kunisibipewolikivif.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/maninovipobij.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/kurunodaxirukulesuxur.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vasalibep.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7f2ff5318c678ef6fe4c95124408cba4/36685182929.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/migenob.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/wibogonidojobenobonibet.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xetezufuzamo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ruadrdr66ok2il2j6mpc4lei0/71200109224.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/winigotav.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/godelijisibiserukorajo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6f5d038c---53233527821.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606facaad6660---84849931754.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/zukod.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087969a9d9c8---56368182728.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/sepatogur.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/14740232794.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5e151468d---vabuxuwak.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jagisuzodobibo.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://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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 11084 bytes
SHA-256: 18749dd42db74cd59f2a58d31ca2af6c58c4f92f53252c2b4dfd12069b0fdc63
font_02_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 16544 bytes
SHA-256: 853a7fed36e5203d1bebbbbf83f0a6ba155e423384abfd78ee640c3b565f9e8e

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