Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ad58af0faa7c1c…

MALICIOUS

PDF

89.7 KB Created: 2021-07-13 16:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0d64598515a4afb48b7cdb1059f6331 SHA-1: a2dc2b53484b61783a0a00f39596baba646b9002 SHA-256: d7ad58af0faa7c1c2500beafe3f414580fdecb9e6f0d0174415af4caeaef0358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, directing users to various external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

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://medvor.ru/uplcv?utm_term=beating+the+bookies
    • https://seikico.net/img-tym/files/konudoriwekeg.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/153de3bf5b6763fe174a064586d1c8ae/dajizogafaje.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ig959b5o5b17sbrai195v1kjrs/12728908662.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd8273252---wadutisobidaxa.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/12254771380.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d492168205---27300676955.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4ab763a844cf2f77d831b2ab6eb12cc5/guferewonujonefibixu.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083816313954---90680825803.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/afabb711daf0e55ca8039c5b5c695cf1/93627864044.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7a379dfb762e56b1ddf937a83904af02/98608037907.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vigowa.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9825390dfc---riwurepa.pdf
    • http://firanywiktoria.pl/uploads/editor/file/gomukoguselogomopod.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/pikujasirubiwadegulerekaj.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i86j9n6topf2j3e5n49sc40d8o/96945424305.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/nemubef.pdf
    • http://akinmedikal.com/uploads/file/96210211310.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ftlsbkpol8i62uumntqfti0ijq/35590345545.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/27823899494.pdf
    • https://stef-nancy.fr/upload/document/20941998287.pdf
    • http://sportsgarten.com/editorData/file/56273668184.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4m2c2hq4e7sdq97gntf4n1s7jq/35279036535.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c227de44c4b---83470772450.pdf
    • http://alumcity.ru/userfiles/file/51373885774.pdf
    • http://skyfestival.kr/ckfinder/userfiles/files/55718935257.pdf
    • 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_off0000fb8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 16792 bytes
font_01_sfnt_off000113a1.bin
813ea8e6cfdc06e5726bb8c11a16500db5b57280bb7d407051598df6dc73a8e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 10528 bytes
font_02_sfnt_off00012b93.bin
e2f2ed7e199d13ac8b87e0aa501a98a2f52cff841a31b3f448501a08be2ec18c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 17460 bytes