Malicious PDF — malware analysis report

Static analysis result for SHA-256 454ee2f9a9a572f6…

MALICIOUS

PDF

70.8 KB Created: 2021-10-06 13:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 278c8decafbdd15cf4788ae2da966d42 SHA-1: 7f7ed35d3e3a6a94ec5e8feeab9c2a9c09d222ef SHA-256: 454ee2f9a9a572f6879a6627b7016761de0cb2cba8b777651f67042c46e29bae
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=punctuation+marks+test+with+answers PDF link annotation
    • http://vlajamo.cz/images/file/38897424326.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/83953168005.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/fajalo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6be6636cd---78092675675.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/giwilafiduka.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/20131222443.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/zijis.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/82efee126fd0956055e899f66568622d/65798846769.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/roluxivozokexopod.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/pixujitoxo.pdfIn PDF document text
    • https://geloracinta.com/contents/files/10163131143.pdfIn PDF document text
    • http://prota.ru/upload/files/47658843149.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614cac85edf4f---pevejobedoxolo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/50999865106.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/pevijivukemavemirose.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210921_42CFBCEED72522DE.pdfIn PDF document text
    • http://lonsdale.ee/tipikas/uploads/sisupildid/tejebiwamufezifekoxosu.pdfIn PDF document text
    • http://identik.hu/editor_up/fipewazuxufegalub.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/45770989672.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sarasib.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a862ed397---divali.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/28416906003.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/1925588148.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/barox.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_off0000b654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB654 15324 bytes
SHA-256: a1373edb380655deb32114f7b9f7df47551bbc706b97567158f9f36e9976782f
font_01_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 10728 bytes
SHA-256: ed546e30a7ea94fa8938cb3021b2ae8e8937f30d95078bf57255a8d1d3f3e1bf
font_02_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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