Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7d3993b985d536…

MALICIOUS

PDF

82.4 KB Created: 2021-08-19 14:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c03c494312cf4809f692d01d89d32b3 SHA-1: d15685f4708a66af9130fe20052735404f71d8be SHA-256: 3d7d3993b985d53631f07c840bee81c477b7d5f3af485a84756904e28af8d663
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://presssimayeshahr.ir/pic/file/xenovejakaxekivuxes.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/b1e6qrehnunn8k6gsbt0h6qca1/bowinesuzabe.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/lametopuwinubar.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nesilawasakujexipugi.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/zaduditi.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/596b734772600c302f966dc0b266b544/9685515671.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/16982144353.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d0ae1690f21777f0a78ea01ba9052497/6578317714.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/26300323383.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/dugukivedexo.pdfIn PDF document text
    • http://ezibra.pl/upload//file/45980483062.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/40203d50cbacbbff56db9577287861eb/tezafogobexupoja.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/putawuwafomadus.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/92e105d7a629098ff853a6f9857cefc5/11214485946.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xegifudafanulefu.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/mudazu.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/jimefaforupeji.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/2982878953.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb00908037---74342787311.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/db84cd01191055450a1edea549987500/fepowaresar.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a414d787c---timanipebimazi.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/fazuxewugiduwikudani.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/49331ee90a50d6bf50eb0e4c73d1dd36/lamovokefapape.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16117786e45f92---matax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+elaborate+entrance+of+chad+deity+onlinePDF link annotation
    • 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_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10620 bytes
SHA-256: 6d8830ca3d431c391dfbe2bac3cf63798c6fc5424966b89fab6afce5bed488c1
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16640 bytes
SHA-256: 6364161dc211eede0a376a7a9597cc747976f9a62e1bee0edb7b51099057411d
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1