Malicious PDF — malware analysis report

Static analysis result for SHA-256 79786867d2a68dcb…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 21:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ecc8f0f261e027fad84526ebb249116 SHA-1: 34d4a8f51e1df8c5f9084f7c4df36a3515e2bc62 SHA-256: 79786867d2a68dcbcb6d4ff7c309bf8cb3df9d929e5015adebe16bf4da518752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting malicious sites by disguising the document as a user manual or file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=beko+built+in+oven+user+manual PDF link annotation
    • http://tlxzkj.com/uploads/file/120118385730.pdfIn PDF document text
    • http://bdaudit.ro/userfiles/file/26697294764.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/23243678946.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b50da2094eb---vibevedarowub.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021713425209315.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/fofutafojuwoz.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///2021831242371433.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8524dfa5c---3745555246.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74158f4f5---kamekurigazunijidamududak.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/20666087683.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/44063854579.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608abff1687eb---wilokumuziraleb.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/71087215195.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/40520653269.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28733096998.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/188bd6f5ce18f552d92793f8af166a25/gelubebixikafo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8969451a6---vomusuwepuwitebusexujumis.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609230508d49b---daduzabetituvuwaf.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/kizejujagemoxenug.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/93577518147.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847a92ddf42---xonatepolog.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/wiwapimad.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zokamepot.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/55562020843.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/bexotafosun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CD 10720 bytes
SHA-256: 66a74e20161f1c5cc86df5c54f5a5e34040982ab515be1c236da502cf9646763
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 15624 bytes
SHA-256: 58bb9e30597cf897466c338950f174841ee97ae8abcae46658a11ed2a1bd6feb
font_02_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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