Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb4d594141a6c10…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 21:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b7e9c34a255f9773f06a8bdb1052b95 SHA-1: 66fe113352bc786778b2b6de1c9cb9b0784721c5 SHA-256: acb4d594141a6c10f07ce900b3d8877bb95b3f4174562383315996232c3e53b6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=pedigree+genetics+inferences+autosomal+disorders+worksheet+answers PDF link annotation
    • http://rosabaum.de/web/editor/files/zeworolapilereturuk.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/70348467932.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898365c89cd---83107502915.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210826203249-86755037524.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/53915454794.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qisq34iumea3hs0sh9p1p4jgt1/91947666216.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0d3f6573b---wuwazupivefizalebokoj.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/62214332801.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086accbd691f---mamidaxubinose.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8fa12451---79990503740.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ba1542e1ca871eb40a0fcd4491311557/fatikavasarage.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/30995035774.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/34186927551.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/71jt800msped1bg7u03sfddjak/64357669003.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/15298112458.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/tccs89k0d8fhtarcmua1nc4hpk/jenenom.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kipaweb.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0699c1a5---3230341891.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/vovoxo.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/pirusebawe.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f72524796896498a2141286928e791f5/18960559371.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081571207a72---15126053054.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/moresujonolanunaka.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/94111349338.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc059fd4492---pegiges.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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 18300 bytes
SHA-256: acc740a8c51eb5c7fb8b14806a97e1c82354a8ced1b28b1b8e47c0957674c711
font_01_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 11200 bytes
SHA-256: 63ab456a6adcc1f08976ce16261f5b7448968a8ead2133f48e21787abedf706e
font_02_sfnt_off000142a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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