Malicious PDF — malware analysis report

Static analysis result for SHA-256 d128aeaccab794b1…

MALICIOUS

PDF

92.3 KB Created: 2021-07-06 03:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 775d7f631b9886611041fdcb0c50de24 SHA-1: a171f05b3d6f8c5f1567b24efe60ee37674e68f6 SHA-256: d128aeaccab794b14cbf7c74c64b4785ef168457602dd62313222502ef91c77a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://fontaine-eva.fr/userfiles/files/mudujabok.pdf In PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084658269068---66639287113.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/88658673689.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/15tovletmhep88lf6euhki3ql4/98211336009.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab43785d7e---86616160861.pdfIn PDF document text
    • http://skomi.ru/img/files/file/96244797672.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/59706539361.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b94002794b3---bulom.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a435771b058d5e4af91e366871de5979/tukaripudelilozo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960bd90a07e---buxajetawutus.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vamepupaxojevixelomajebut.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c6e1ec8c---45756283043.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kd8fb9fb7v2kkjv6frv45p7qqe/68703801054.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160945da19262a---84805863631.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/bazubomide.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b7e0d8d6---kobodevatoto.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/lexiwavatibude.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c442ae988---sowetuzedefopuzuwuf.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/b8t2anr01e60lhs6rhjsjgsjjr/kadesotepafebutupekefu.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gobozumiwepariva.pdfIn PDF document text
    • http://jarosi.hu/files/file/kuwezevuzefi.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/61832377906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fortune+helps+the+bravePDF 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_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 28248 bytes
SHA-256: 236f64c4187a6707474d2be4191f566b5805727e0f9d492414fd96decfc2a451
font_01_sfnt_off00013449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13449 10540 bytes
SHA-256: 4f6dd3bf4f40da510ff6add1d304852f89baaa8771564c0ef6d996887f7f3185
font_02_sfnt_off00014c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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