Malicious PDF — malware analysis report

Static analysis result for SHA-256 996e347c7670c848…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 08:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 225a859ec78392fd85743eabb3022402 SHA-1: 3c679e2844c038442159bf42af49a06ccaf145b8 SHA-256: 996e347c7670c848836ff49af596d2406f085e8b328626eb360234754e556f9a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially malicious PDF files. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users through search engine optimization or phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://atlonnuri.org/UpLoadImage/editer/files/11836668662.pdf In PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/99220024325.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e5981d27f0d243be9848c70e63adddc4/tikeboloxifujolinediv.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/64554064160fefd6eac0d06ec9f6ba70/99541561423.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878cd3a7b66---zerunebifipodofexed.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7a87aaef---71238788612.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mslanmcac7mu68nnqtkm7a34vd/zuwisejefezasarevif.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0b084c7b1ea30854fd20f667292e5ff8/11998650051.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/38213848887.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fd9def5b345c80f6c659b421e351a700/65116818102.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce74b0c357b---84008750270.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/45196041498.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohrfnsp1gjhi9ptfvb7m5ms5pc/zuzaxef.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5e3ehbi2voftqdgnl3g2sj16q5/vimemimuxufegakewupub.pdfIn PDF document text
    • http://medica-brno.com/files/22338964788.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210608_73B0B232EF066F46.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/kadafosiborojurilada.pdfIn PDF document text
    • http://freewest.at/botusudebone.pdfIn PDF document text
    • https://computerzone.pk/file/49012376102.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/jorakafi.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/59622695731.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/sininubavefedevumexila.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/972865431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=thermonet+underfloor+heating+user+manualPDF 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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 18384 bytes
SHA-256: e719d50b3da77fd349f876660107ba8adf54d0bac6bf4c2d5f2eb9e04ed69a65
font_01_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 10864 bytes
SHA-256: f9753197a281eee42a90d7734b4126f0fcf831a61e6c01209f92cfaf3666dd94

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