Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7b7489d47f3215…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 15:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f17a3bdb573fef9aec50665bfbdb186 SHA-1: 759135afd767b3f9fe5b3691ad274cef4fdb2847 SHA-256: ae7b7489d47f3215ae61dea62b446b23dc5da68ef9c635e480d8558fcd274e62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8610

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://khoahoc.timviec365.com/picturesfiles/67618346646.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161360492c9a93---vanoravotatiz.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/gewajebufelugak.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/49891187585.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fokogisuriralexopun.pdfIn PDF document text
    • http://kasand.com/userfiles/61234597180.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301ba7dbb1d---bagukazafobugadepitiwokap.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/45183671487.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc17a411a---74292471373.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/watubamenopomukafemefewiv.pdfIn PDF document text
    • http://egitara.com/upfiles/files/51600232579.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kotozoseberatokatube.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/64324458496.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/zedozevilogatanobidoji.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/50725106611.pdfIn PDF document text
    • http://meditopthailand.com/file/80640757317.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/38475603286.pdfIn PDF document text
    • http://steinemann-ag.ru/rovuwefewuramifup.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/19fec863e60b48a37856362a2b70aded/jusesonisusedazubenot.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/60310648743.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133582083783---gemabenagidezenepaxatoreb.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/30526803298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rally+fury+extremePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC413 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 21784 bytes
SHA-256: bfa82c9327124808c25a5e9b38b17abf9c59c00ffd57cc5a1b944dd6f01ab260
font_02_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 10252 bytes
SHA-256: 55dffbe5910d807c49e06660c5dabafd6be284e10930a7eb6a469600368ac9dd
font_03_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1