Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d07fc347f30394…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 02:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f0dbaa666235cf9a777796e3bcecc33a SHA-1: a87a1de81cf58409a1f87ad6f7ef10de956bf7a4 SHA-256: 27d07fc347f303942b33c3f49af29a7e70b0c133750cef94d762af10d5ebfc01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads, specifically WordPress sites. The ML classifier and ClamAV also identified it as malicious, with ClamAV classifying it as a phishing trojan. While no executable scripts were found, the numerous links to potentially malicious PDF files suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607383204402c---25055576340.pdf In PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/l3lhe0rjqk65t5rfi5eko3cbi4/kuwojizegi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160928ebc6874d---gabunulegi.pdfIn PDF document text
    • http://malifer.hu/upload/file/34290742944.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c897ccea3---roxuwasokujulitawuw.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/43647051992.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/vexuvij.pdfIn PDF document text
    • https://magatek.com/documents/file/53531362528.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/keniwurodipavesemojeru.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9519c544992fd50ac3a2b6d5a42719ca/71190486040.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ac536a90---zoxaxebadow.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/16388920833.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/126d69bad5e07eadcb0f4e95df77c262/gajugiwute.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/84198945627.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/73596803595.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/78735681106.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/le70vhngqurtqu5v0ui31nm1tn/82624258162.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609989e2d23f1---781249986.pdfIn PDF document text
    • http://fkhd.cz/data/img/ginuronofol.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/mekeritam.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2535adca6932ad240f9b7a4f56c84c2b/79809649384.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078730ae0499---sitokatitanufamep.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb136fece---tifokikokotusedogafas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=naap+extrasolar+planets+lab+answersPDF 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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 18232 bytes
SHA-256: 7c4cfe57cb7a9ffbe4f38ae3f2ed37bf754acfd998d4f66217f550fc4734a20d
font_02_sfnt_off00013378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 10456 bytes
SHA-256: 592404c612f49c049a0c05c25abdda3de536c0c37e4dee19bcbf261c7f4bd023