Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4759bd5876b0c4…

MALICIOUS

PDF

104.0 KB Created: 2021-07-03 18:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25d93135a990b3bc21bbd3e220890104 SHA-1: 77e6b9d6d53da55899b12c011c9f3aa5b78f8d05 SHA-256: 9c4759bd5876b0c44c813a5a0ae997e400c5ada430a940a4f2c052128aabb01e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://philabc.ru/uplcv?utm_term=ameliorate+meaning+in+english PDF link annotation
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/jowol.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qsfj21lv5oimp157nvh38vefc0/gamodurubu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/mijaxapegetugedededewa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750736ab3f8---bililaxupezoxet.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d038a1c336---63081620975.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i20u0q0v29a5u5qihbcvmiasj8/vigofiminokoravatirobumox.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/1010319218.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/67661341672.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/32e0fa3c9f7e12c4e67f7ab4af54aa5c/73239911093.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a47c24b8---fezofeda.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f77ec92acb4fc20e59caad4826b7b446/43765807140.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b916dc052---xetifigulenir.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/70781375622.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e1385107---welox.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4145bc0a73---gomizikedijinorosirevu.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/turetutupibopaxiwoxuremak.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/visifetokoxeturokirogezip.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/fopovojasuvidiw.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/fenazojanogepurekizagu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/89380733277.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/voxavojof.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea609053f---pevokugosimu.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/25479811625.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609da468dad1e---povodupazafaxa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c32d3ac9---fapomigunama.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2850ecae0853e8fe347c0b8cc9c1df68/digazotakonek.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010927.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10927 18888 bytes
SHA-256: 0b67700dc3483e1b30fdd92ae1837f6b54ae1d239fc29ec8be4d2ddae90a51ce
font_00_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 10536 bytes
SHA-256: 88974eb28e3f38dd5edfcb62563b4528c3a4f61358f7e7bb46f9760928618191
font_02_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 4156 bytes
SHA-256: e9ca18a5cb74ab091396bfa8e9646b3a84b5c9d28d0d9bcdffc7df8ed8aea99c
font_03_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 25644 bytes
SHA-256: 0fde8e2b37120f75e2486d67db4434f905826a1850863d600a9877c67c55af64
font_04_sfnt_off00017800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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