Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbab3aa2d4904640…

MALICIOUS

PDF

93.6 KB Created: 2021-09-01 06:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31ef1a119b75e0f8be33c79dec21c4eb SHA-1: d881c1bf5c85bd16f849c849772593905c069c78 SHA-256: dbab3aa2d49046405f3b0202b87cd5b3f42686bfad6972bbbf6abaf553bf41fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://smidgel.ru/uplcv?utm_term=love+plus+nds+english PDF link annotation
    • http://danangsculpture.com/uploads/image/files/69560954029.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zojerefurekej.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/45173761078.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/55758363671.pdfIn PDF document text
    • https://arendic.cl/files/18060992449.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16120e3691e5f0---vagepoga.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086998b9a695---xemuluwaromibof.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcad08bf8---48377317164.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/37903500633.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/90118339703.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xesitemufaz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vanebukupemojado.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e68d9b14d0384fe8a53960b724450ca6/60575319997.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kalanakud.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/gazovaz.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/9750221319.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/79719874752.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbffbde3885---10134883052.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/50902478221.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098b742128f9---5663110050.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/20423540253.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/powixa.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/nevaxog.pdfIn PDF document text
    • 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_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10432 bytes
SHA-256: 40c3ec11b186a5ee82633181b1aa24b3d19ed1e05af7832114ab346419fa66c6
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 22320 bytes
SHA-256: 6ea64f65abe246daaf4f143896f30596210a647614a83e6553925fd1a7051079
font_02_sfnt_off00015172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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