Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf686989024fdcd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 22:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb948f4a17b3ea9edc17175cb0c68747 SHA-1: 2b2893c7006ddea0993691e6e7245c94e19f5e49 SHA-256: 3bf686989024fdcd543e7c9427ec28d3e2924839f444e519ff53902ac77df8d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://businessvaluationapp.com/fck_files/file/14708789282.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609655851a026---92864553416.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160820f29630de---zawuwaj.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/xagiwapezofugikefaxaxun.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/mowiguloxurukujikexenub.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/mexurogodopiro.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f82f99a52012ac23709e588dd951d96e/79121332766.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855579d100e---toxozegiv.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mofumetedaxezalukosej.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/5640315062.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df40ce1f35c---veratuxododif.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/95351602387.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/polawalarezusa.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/60297420389.pdfIn PDF document text
    • http://plncse.hu/php_data/file/fedokuveduto.pdfIn PDF document text
    • http://wirheiraten.de/images/file/50774591723.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/15827630301.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ovegbom3julug4a1k2745dgi4r/nubevodulun.pdfIn PDF document text
    • https://domilot.com/uploader/files/54333916892.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/leful.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4p6jc67j0329n4udm5st6eot1r/dasogesupemewafasadu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608429ba1ccca---51490539034.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/8b5a0e465adba1d370ec80da6513f726/xodokidukuzuvelinopobiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pioneer+vsx-534d+manualPDF link annotation
    • 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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 19300 bytes
SHA-256: 4949a7c09967f7770b9302c25f8773cb2b2ae7a634017ca57c1c9cad91fba4ed
font_02_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 11000 bytes
SHA-256: ed6f324de42a430cf947daff313c420fee12aff91ecd916489f2c8590022e583