Malicious PDF — malware analysis report

Static analysis result for SHA-256 496d55bd8af99b15…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 08:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 693098cc3e560ac4ce3bac2b10c1d38d SHA-1: e909ecb1d2f920aaf0e102c8629aa08eea7d8bfb SHA-256: 496d55bd8af99b15ee24aa84b23372dcc658f5299d127294b180019cbb168255
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF's primary purpose is to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://df-2.de/images/daten/file/45150641176.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df39c6a08fd---8199391776.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tigurirojabojolesej.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/52947901279.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa3473d61---5143980586.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/42720090428.pdfIn PDF document text
    • http://vtaky.sk/media/file/33825592287.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a0024ea6c8ecf675ec6d5ce796404a52/tuzilugidewarikim.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/s1rpk7hrbkik68v385e57p1r9c/36402676877.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845e908db4---17641034332.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf467b58c90---semifu.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/56279443075.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/23536511618.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e6jdr3r7lnmt2eg9f3dbvdihce/pewurumupawipimadewoz.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/78094621203.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920027ef57d---xilugotuzojor.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a7655da9a70c938f004af9eec0a5472/86708646449.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160819c26de0e7---vivokurorivow.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/11357502812.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/96790533642.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/973656214.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01b8ab0ada---sedizubu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/piguzut.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/nixuvozewubulede.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jukejisejikinizorukilube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sherlock+holmes+bengali+pdf+downloadPDF 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_off0000cbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 11360 bytes
SHA-256: 238c39ad06da6b51486414da293db58808cfe7f1dd56679401ff6439d9641af6
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 18716 bytes
SHA-256: d6d3806413a8d3d1ce832fe4b8ee8b190cca8e5abd13853caf2deb9d1d893df6