Malicious PDF — malware analysis report

Static analysis result for SHA-256 85842a9a135dc39a…

MALICIOUS

PDF

89.5 KB Created: 2021-07-28 03:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74bda1230354dc9441a66a08302b680e SHA-1: 3a8b79eb97ed4bdcc1d7ba6918310ff9bc34b4b2 SHA-256: 85842a9a135dc39a6dadb7569548c2985428fa385d094e82bc4f27c5555f448a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The presence of numerous embedded URLs, despite one being marked benign, strongly suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/jonosedupa.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dec3413b---sunasopimisevuxonipuxa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/t1bgb160tkahnun0m9idbf2k6m/dozilabozuzimora.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/10007514905.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/354475812756002220193d8448111989/kawew.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/dekowojav.pdfIn PDF document text
    • https://songhongresort.com/img/files/kujeratasago.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wosuvumakemifozudagimifuj.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607642d4d4321---74328723106.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fcsejsm2d4d6ah3ndl5p996hk2/kagedufe.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xizukukur.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/99e292a732fc3b3b3e8f00954d8bc723/basijas.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/74366f4e866bc051f42911bd3fa1012c/lejorubasizabezubi.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/80394944422.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7cba5f94---fajig.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5ad3b529c6fbf7ab4648729b0fb119ac/fevapudefu.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/1ji5labat5bnbfnrig0e94k179/16088994144.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t3evrgen9k4jk4nocq1a04u1a8/98441304344.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vojutofotopabakar.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794cdcd15cc---tolujupovubatumisumezine.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dde0c5f543a1da7177271fcc874646d0/46167710497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=need+for+speed+most+wanted+cheats+pc+unlimited+money+2005PDF 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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 17688 bytes
SHA-256: dc54a988ee8f09304ab297f4c621bfe01fdc648910ff915e1fa435ab7a59d343
font_01_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 11540 bytes
SHA-256: eefb64df0a47eb451d6a00dba6fc088ff6a09fbe6be1a0d82392a2804be5ada7
font_02_sfnt_off00013d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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