Malicious PDF — malware analysis report

Static analysis result for SHA-256 e155662d710a1464…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 14:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cf21341ff7b7244c2188dd18c53cfbc SHA-1: a1eb56ae1a6d138ac9c02df53a42cc3e1e5af74a SHA-256: e155662d710a14643d089184d4d5883b882faea48ed08ca089de950eeb2d58d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mecaniquekd.ca/upload/file/xodosonurexadewikuni.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4dd17538---nimeruvabufokum.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5d787fa81deebd7cc98c043d124b3810/buxiruvopoxezovasabi.pdf
    • http://akicgiyim.com/userfiles/file/vosaporedodisepokabewup.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da10ea96f01---97993797576.pdf
    • http://osteriadelcampanile.com/userfiles/files/77400913855.pdf
    • http://learningkey.org/userfiles/dorujifiwadodel.pdf
    • http://ccswcd.com/userfiles/file/zefalajebewuzasitoxetexon.pdf
    • https://jmcoverseaspvtltd.com/uploads/files/riwibiranivefusajotiwi.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38a6eab92---noparimofegevabovo.pdf
    • https://marathonlaval.com/userfiles/files/33429260852.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/58060338004.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16117bb188ae80---88866408397.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/918stph8uusnkc0406kla6q2b6/zefuxisobuka.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f8578607---63177928249.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc6f39485---todose.pdf
    • http://piqiso.ru/userfiles/file/66184755512.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/pulakilo.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/36ies4nqmvp0sqspv894eipt26/40478992430.pdf
    • https://www.almuhja.com/ckfinder/userfiles/files/fovepokofamazenapif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=four+quadrant+graphing+characters+worksheets
    • 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_off0000c7f3.bin
e1aee031b2c6f273191d85ca5ca08e67ad38e5b6ed72eff13786536d794ac4a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 11148 bytes
font_01_sfnt_off0000e183.bin
c52be987d3b4b49de288317c81a96e60156f303bce6297713b65a9ede167fd5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 17424 bytes
font_02_sfnt_off00010d65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 16792 bytes