Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6e0ed77d04c429…

MALICIOUS

PDF

94.8 KB Created: 2021-07-14 02:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe759603a6f4d8c6f5f28660f23d676c SHA-1: e43489d8e4f215013e9f687c78546de16638bc96 SHA-256: 1c6e0ed77d04c429464a758b6b8aa8a12a3b54dc0df7a0904b87a4c8f59cce4f
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 uploads and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://windmill-bv.com/userfiles/files/puwobixesat.pdf
    • http://nanumed.ro/uploads/files/24350802014.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vb5u3ee52lfjtc6o10j581iu53/52402927495.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20a867734---siluwikatapajigakapu.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/39041064202.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a422a762582---kiwefuwobok.pdf
    • https://tradingphrases.net/userfiles/files/tutatuviliwugo.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5c9d90593---torowolavesavusobak.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f2658d0ca91cb50ec23722e7255d5705/zezusetokefegolavelala.pdf
    • http://poltinik.ru/userfiles/file/sonobiliwugusij.pdf
    • http://uctodane.cz/UserFiles/File/pajakaxobu.pdf
    • http://cokhiminhhien.com/media/ftp/file/xutiwubejoso.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb53c21079d---lomefuxalifezajev.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099e996a41f7---kitonuwodoguzuf.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609994f0722c3---xuwowitok.pdf
    • http://ty-universe.com/image/files/20210704_074414.pdf
    • http://liburnia.pl/userfiles/file/87950082160.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d71c99ac2c347a6bd31cfb9917251c7c/zejozusek.pdf
    • http://abroadster.com/files/komimakibiref.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e0b7d82aff3aedddb91cc840bc02fb2a/45343689191.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5fe405b1---44312267720.pdf
    • https://kurek-rowery.pl/user_pict/file/783578385.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58636cc56ab24ebdbfc4a20598d22fd1/46006421698.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fa5244f8---52106159750.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/dff868726cdefb40baa90256688f4737/4786473630.pdf
    • https://fetogram.ir/images/upload/files/gezexonulex.pdf
    • https://ahreco.com/uploads/news_file/10781466780.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=army+officer+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d29.bin
cc6e11a9f57a825b83d8226b1834160d49f3beeca79cf91f6f8dfe84ca781ae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 17672 bytes
font_01_sfnt_off00013bbe.bin
9367ebaa0572326dbd95a6534dd7ccccd081151b92d8296d2152c7655bc2211c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBE 11084 bytes
font_02_sfnt_off00015580.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15580 16792 bytes