Malicious PDF — malware analysis report

Static analysis result for SHA-256 99325a33244dfa0d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 03:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70df3d9cdac31d89e51b87336fee3a9e SHA-1: 9b0816e65d2fe92e0faa54cdde8d067082444855 SHA-256: 99325a33244dfa0d764f6d13d14e8c04aa406386964211257f145fe77e545a1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adimhukuk.com/resimler/files/xowamukoxi.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/caacd2adc7ecdc53461d5c6baef928cb/wakot.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b242dcc9d48---56086887681.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/46759321236.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/deperadowematupe.pdfIn PDF document text
    • https://spacio.hk/attachment/file/winavadi.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/92868159791.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/73396381820.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nonanilorikel.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/384da4aefd2285290e5c5402822701bc/pijuboku.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387f6d3ad6---tiwixilifuja.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c20d3e8d---jogaxosalizusotolaneje.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4e03fc55---fetabalefakesu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/88i0j22k97k7qe0c72krulb7a6/wobilenasilu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/potigobufusigekufu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/juxoginefofal.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c18480ace6f---bofakomotigibawiragoxak.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/36535325109.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a60ec4f5b---56353611852.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/17275146450.pdfIn PDF document text
    • https://baptistfriends.org/media/57646347032.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/ravukejejeritidira.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/sazejix.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/femulig.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbe1e26d9---43372922307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mean+girls+cady+and+aaronPDF link annotation
    • 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_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 17300 bytes
SHA-256: 05356b6d88cec4bc34b23a5a5246170fd2083b8e1cd595f9b2517978284dcc6a
font_01_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 10552 bytes
SHA-256: bd8417e1d553d9cf1851c1c411a6643209d7bdcff384fcaab3f7afb898e675d0