Malicious PDF — malware analysis report

Static analysis result for SHA-256 291376b4e7008122…

MALICIOUS

PDF

87.1 KB Created: 2021-07-31 02:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54a690caa75a41d3257fcc2fb41eae9c SHA-1: 069dc23e39b00ebe10624c813db0f57988144f46 SHA-256: 291376b4e70081224ae897a6138b846b929652f34cb0ded904f7a23ff65ce495
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mamtomchabahai.com/uploads/files/files/bafojejifegoto.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/drod11jhdrdmg6d3s52nclvun0/23499298397.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/woxikikuvadojemogedatuzaz.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/30a7ad218987608445a0c629c708b452/rajuf.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/36640426028.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wovuj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c97f02606---62591878065.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084abc57ee60---53279853857.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/67139242491.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/rizeb.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/rijinosoxod.pdfIn PDF document text
    • http://masonhn.com/d/files/69538270110.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b918fcad11ea966b97673507a58ac53e/fonuxusazutarudidaxu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0d09cb69---tajikuvokerarudagomel.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/122f720250a71aa93449681eb604b34c/88162629442.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe93e61913---73599653811.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/74512545450.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/vunumiwabul.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/87485641721.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853694020a0---92697773602.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984e440039f---70454539014.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/muxaziwuvovuko.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210618_119B08D56DD37CAE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=death+race+2+full+movie+download+hindi+dubbedPDF 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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 17332 bytes
SHA-256: e196499f73c456a5d0e92b4eaced0e41161893ba9043e76f5732b4647861003b
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 11084 bytes
SHA-256: 088bba184e2a357fb2ca2ac923f300321bb944d859e5ddc1e9e78ecbbc2626a0