Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f14ecac85ba25c7…

MALICIOUS

PDF

85.6 KB Created: 2021-07-29 20:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05ea6d3fcd349e7e4ecc01cc138867f1 SHA-1: 052173e9b2ad047c1c5fbbab126ae7435de4b6df SHA-256: 3f14ecac85ba25c7e133684899cc9cbd448c5b76385f1e02799a8752496794cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://smidgel.ru/uplcv?utm_term=kawasaki+gpz+305+haynes+manual PDF link annotation
    • http://kapelski.pl/userfiles/file/durinij.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/51094566433.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/78226254499.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/neriranixikodazexoxovo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee61b285a---39911631441.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/65d1f2017c0180ce3da6355c501b4488/mowesaderi.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/8702695383.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vn65nqlm50muft55vu2opj4i7t/magan.pdfIn PDF document text
    • http://vhktn.at/images/content/files/95680716764.pdfIn PDF document text
    • http://nessium.net/userfiles/file/83642471628.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zuniratevezugajuw.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/81640217719.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/80556099018.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gavozebivawa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fc119e9d361f11a2808f1bc9213a0ec7/nofog.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lhvgbgs20uqksbpomil546ih1k/47991372681.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lirolevus.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/55869995345.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/nebaxaseluxa.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tufifepodepapevesobo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16085980d451c8---zeleb.pdfIn PDF document text
    • http://usmleworkout.com/files/file/29357877185.pdfIn PDF document text
    • 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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 11252 bytes
SHA-256: 2a25ff988d25f9ab8742893f9a7fda93f811545c7c3161a5d261b1001cd951bc
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 19176 bytes
SHA-256: fa3fa36c61700f83f8cd070f9be64b3bb0c8ab58724804a2280cd84ed49bbcd0