Malicious PDF — malware analysis report

Static analysis result for SHA-256 8944ce89f9ec4e49…

MALICIOUS

PDF

82.4 KB Created: 2021-07-28 13:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f4602331ad416fc5608496e375b7fe7 SHA-1: 626ef13b1639a91c008272ea2f2343287c205632 SHA-256: 8944ce89f9ec4e49656e5eb947c3240a5d72877eb1a8d2684340e2848ce3d4bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://aiswaryamatrimonials.com/fck_uploads/file/58183151978.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dujs3khvjllqcbqimo0tbln7b2/xofukudax.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b846a485169---83149357911.pdf
    • https://wagaskar.com/media/37106108067.pdf
    • http://preserveproperties.com/userfiles/files/54909249239.pdf
    • http://wisdomtours.net/upload/file/xawatuwuwixuvesetene.pdf
    • https://vanchuyenduongsat.vn/upload/files/58899092596.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1db6ccdec---nipukulajebuvada.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3b89e7f98fbbe90a1592d6fd2fa5a6f0/dopegaruputupumewinulu.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b267ba7e38fdfdb22af2c76db404e803/72180022972.pdf
    • http://gayaarchi.com/userfiles/file/20210607073716.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c578e82b091---20061215097.pdf
    • http://alvitraders.com/files/35220798556.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vo7gtjj6l2no7l8ap1aglb2eq6/39941704833.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/86197909565.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/69fbea97a80bbbbb2411405f61aaecdb/55663723001.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/98fef8a4e828e49934aa94e4924b4db0/givisiwiwitaropiba.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l44hjir7bgaj1t1050lph7oe63/68497538399.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a232295b644---20423208980.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/142f768ac2c6441ea965d5eb5e1835bd/20778096353.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e610d3a82---moxubalepapuwimimine.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b5b30efe91997ede891ae3051723710e/ditigokeser.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210722171832.pdf
    • http://artecgroupservices.com/imagenes/file/41714076962.pdf
    • http://polletnv.be/uploads/files/92907095705.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7fa1b2fc7fc20a47fdeccb92a721590f/81867234728.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ejercicios+de+tilde+diacritica+para+ni%C3%B1os+primaria
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16792 bytes
font_01_sfnt_off0000f1f4.bin
85ee019295396f29e56eb238931bd756b6eafcc33e411ebc32870ef4f816c787
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10996 bytes
font_02_sfnt_off00010b22.bin
010b56b151c451da4c7d1f2a026cffd3beb68c2af33ef6928c2a1e768e1aa296
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 18052 bytes