Malicious PDF — malware analysis report

Static analysis result for SHA-256 154c1d25a3f9f099…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 18:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb8741534ecfa1c5c52fff5983a18919 SHA-1: 8fd5d592641cd3d3acc402e16fefbc4ba1eb5e60 SHA-256: 154c1d25a3f9f099ac80deca3ed22df766613076b3c8ffa5e139cea6bacde226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aaaexpressac.com/userfiles/file/68412963596.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9239b9a8ed---lokunuk.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9qac7sqau9pij01jobdb7pv69g/25988105880.pdf
    • https://soalmatematik.com/userfiles/file/62453053758.pdf
    • https://biothiennam.com/media/ftp/file/81518004461.pdf
    • https://aokman-drive.com/d/files/xigilugozuko.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8630e872c621f20e2845ec73fc2b0546/15136784163.pdf
    • http://lalinpress.com/ckfinder/userfiles/files/vilogebofebuzizarerasufij.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2e0fcfd5d73d574670bc2bd61e6965b4/tixopu.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f456ccc65d---76250108389.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7371f8e9e7---ginuli.pdf
    • http://shukokai-voves.fr/userfiles/file/5315787160.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c100aab3e7e---jorutugutakitemozadikim.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b988d1ad7f3---87406090814.pdf
    • http://446888.top/userfiles/file/budowazitefatuzaxewumatil.pdf
    • https://tonwen.org/userfiles/file/8673310446.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d5d146a73---48582578484.pdf
    • http://synthecinter.com/userfiles/files/mumetudowelizep.pdf
    • http://amirafouad.com/uploaded_files/file/retalewemuse.pdf
    • http://splogservice.ru/content/file/9863715840.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe8743bd0---97910469969.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/amhtr071oo9t4v6t15o2iu5j01/baxukabutejev.pdf
    • http://alfavit.tv/userfiles/file/zunovimuzexuzuzi.pdf
    • https://decoveinvestment.com/userfiles/file/51773459394.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=will+i+ever+find+love+quiz
    • 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_off0000e9fc.bin
aa0ae2974ac62c918729723ab1e0bbbbb23968143bf089a998dbac2caf9f45a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 17588 bytes
font_01_sfnt_off000117fb.bin
d190107c095ff500f425b824d439b474919e6d9acef9ffc7a08fa1f41b2099a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 10284 bytes
font_02_sfnt_off00012f00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 16792 bytes