Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b31618992cac8f8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce0af6364fb85d4580a5efc6cb2460e0 SHA-1: 2001f7ef178c9e1ed28ed8c00e08586b19af9ca2 SHA-256: 1b31618992cac8f86b5b45838eb69b5d9399d379d9b5c94d98befc8b8944293d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or malicious link distribution scheme. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click these links, potentially leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://weddingdiy.cc/uploadfiles/files/20210703_105424_8133.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/384f32a788479f407c87cb3c8f1eea22/devewemota.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160846464cbe04---26140910244.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/vedisuxosegubesumitakuz.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/lodiminobalemijexajojij.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/mumamaxutovem.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/vilatirolezozunaderejivi.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/godekerorujo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e57fad314e9---50598625823.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/31250027633.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/37999088890.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/089ff496db0de5286f34b93567255901/38939252208.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/91449769647.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/9566466550.pdfIn PDF document text
    • http://gabortech.comadmin/file/85156042742.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/kalegofadunanuguw.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/76880102157.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/kepejifewulotagefiku.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/kulumivurapunuvibazo.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/20355020253.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160927fb35d273---73294521724.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5ce96a4a---belagadaxevejasogif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+rocks+and+their+formation+pdfPDF 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_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 17708 bytes
SHA-256: 9620b32b9eb25d2e455eaba114093f8902b45eba438efd0bc9c56ed9cbd28502
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 11008 bytes
SHA-256: 1439bfa83aac51924095f1d039c30f8fc0f5d0e4572e6da58e6d9966f22200d0
font_02_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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