Malicious PDF — malware analysis report

Static analysis result for SHA-256 386e8172d9172218…

MALICIOUS

PDF

95.7 KB Created: 2021-07-16 04:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96153876269b599f631cdd162c8e32a SHA-1: 2c871502c37db46742b656b6e67cab354418f23a SHA-256: 386e8172d917221881e6611883baceb048dbfd694dc5eeb5072bbe572d8b99a9
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=lifco+english+to+tamil+dictionary+pdf+free+download
    • https://kit-veron.my/ckfinder/userfiles/files/puxojenetefaxuzabenovajul.pdf
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/karabimow.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mbia2hgo01n8nqos8kunssaips/xevoxelitizakuge.pdf
    • http://ambvetfanini.eu/userfiles/files/vopatiji.pdf
    • http://stalmost.pl/userfiles/file/15787232703.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/saketajiziniborep.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/30414183029.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160747e70c24b7---legika.pdf
    • http://sgyscom.com/upload_fck/file/2021-7-1/20210701180338503631.pdf
    • https://valve-toho.com/userfiles/file/55412201793.pdf
    • http://charnafamily.com/clients/60216/File/14218783083.pdf
    • https://imagebeaute.fr/userfiles/file/misozekevaxedikuxipa.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/83661cfbba6d3f3d2a258a82156e3c53/77437617950.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf321a78b---96172410450.pdf
    • http://iamsong.vn/uploads/files/lazukotusedojaropowexo.pdf
    • http://xlsferrosilicon.com/d/files/marelijaratebufudumexe.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/22a1b7dffa6ddffd5d8d5e1efa8586b1/jorafibezugababiferonukiz.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00344ee784---ziregasidudavake.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/aqdt3uo9hqk60i7eum6h7q5vve/56750028192.pdf
    • https://styliststudios.com/imagesTE/file/kedevanasifujujokegotiw.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160830113407c4---72512242090.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5642aee4d---garowos.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdf
    • 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_off00010e64.bin
608af451ffa2c1b491a8ec239e59e475779d083851acd8c38da91bcdfbf771d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 11224 bytes
font_01_sfnt_off00012859.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16792 bytes
font_02_sfnt_off0001406b.bin
cc96e1879a0290b38427ccd00855a6c4168fc4a2b1a06eb7b7ed541bd1646a0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1406B 18376 bytes