Malicious PDF — malware analysis report

Static analysis result for SHA-256 895c85ff152211d2…

MALICIOUS

PDF

73.0 KB Created: 2021-07-20 22:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5be3e848fe97cb9a19fa824fa8319de8 SHA-1: 537572aa8958d1090b1906b88c1865f821525f07 SHA-256: 895c85ff152211d2c628ae9a177bb211f81a95db65546f7c36e8f4f28a78bac6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF-related heuristics, including compromised CMS upload links and disposable hosting, further supports this assessment. No scripts were extracted, but the overall pattern suggests a phishing lure for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://amitadevnani.com/userfiles/file/sebikedagurafojumopunem.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d94216677---35111787537.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160978d3eed4c7---kosatofegipus.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3694208c89---pebapagotodomo.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/66cf6f8fc3e72bcf1b752bd7b62e8258/zikaxirexatuvud.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3b040016---vubibatizejasir.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b06246306---kimetisevebuzup.pdf
    • http://apcmagon.com/userfiles/44348858193.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9668b22c0d5e5b9ceb705b8d818499ca/15017318309.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210524/file/16218424307984.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/19eed7bb502307c1b15c1d9aaf3bef4b/vavezaraxul.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6beef1cf---tasuligikotu.pdf
    • https://k-newsletter.com/ckupload/files/21190271960.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/574e1d50b3b01c41ee33d2f451857aa2/tumel.pdf
    • http://aqbnb.com/uploadfile/file/pevilenepadelesanokiwona.pdf
    • http://narcisse.sk/editor_uploads/files/gajuvaru.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/3r0tdia9o1a1bl4dm8elfhvnee/zazafujarak.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/buposujulupirudur.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/1ojdgkb8rh9ira6r7jgeddcd0r/55052820016.pdf
    • https://travelone.ae/userfiles/files/guwojezalasiburefuzow.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1989e2afae---senebu.pdf
    • http://k1a.ru/images/files/file/gezajexoranunetogemu.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160927c9e72e0e---kemuxi.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e2902ef774747134e9b046b2fac0ce4/gutejut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=home+access+center+humble
    • 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_off0000bcb3.bin
f5ad471ab601ebd1b78932323325654f396d40e69749f8dc46c67610f7248d30
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 16232 bytes
font_01_sfnt_off0000e6be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 16792 bytes
font_02_sfnt_off0000fed5.bin
d3b6f5e3583403eb267c25bc8bf5a9c8636e5003d503e66fac63787d05ef4c17
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10636 bytes