Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fbb738f5e5f329…

MALICIOUS

PDF

82.6 KB Created: 2021-08-28 22:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 269e8be8ec0ff8cea6e90cbdb4a98575 SHA-1: 736e444723d2d4bc012f126947d82a703cd70a60 SHA-256: b1fbb738f5e5f32934a682efdcd46bbd1dba0a5e681e176d457d3b25a432c6ef
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating it likely contains an exploit. It functions as a link farm, directing users to multiple external URLs, some of which host further PDFs on compromised CMS upload storage. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://thamcohoaian.com/webroot/img/files/zikukowugetodasamu.pdf In PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3aa930ea79---gulidapejasinejak.pdfIn PDF document text
    • http://rayanchem.com/d/files/47496777824.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a00e6fd0f0e58773e51c2520163ee3e9/73464259895.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832574f0104---fekazopafojopivopulore.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bapexukuzivus.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210713_B92EC9A8E7232065.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3ecc15564---bajajoz.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tidetewegu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/20134145622.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1a17265fbc73e3f31239a9daa7dda4a2/suwil.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/42655030875.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1321c7c2---64572816266.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nimaput.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/nawisasonod.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/94f40c436a3060b1b5939cd548141bd3/219796550.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c7538cc4b---30649288591.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d5a62fcb---xexeviwudiza.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/62c7431814f3846aa58ca7de28c6a2b2/70833307965.pdfIn PDF document text
    • https://cape-electronics.com/media/file/raxenepusidiliziruze.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/fikokefotixagebakenexi.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/73812009745.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb51eb80ff---xekato.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b946573b---74552865477.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ce0e0e563---deberomogin.pdfIn PDF document text
    • http://change4best.ru/upload/file/diborepenazobiwitoneta.pdfIn PDF document text
    • http://happy-land.hu/editor_up/33407573283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=symfony+redirect+to+route+with+parametersPDF 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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 11216 bytes
SHA-256: cffdb2d87e79e25ddbaa72919e61b7b3c7bcac72bb2d36f710e97af7e40c5040
font_02_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 17788 bytes
SHA-256: 3d84e7e2114f36fc14b5c6f02a62b3f5dad9485e3d539ff5fa4744cb3c4d51d2

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