Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecfb753e37589b0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 09:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02daefdaefae4cb7ce89e2875c5ce2b4 SHA-1: c25cfb05882de288a3978691dedf0a640e409228 SHA-256: aecfb753e37589b077ed8830f596b28caa6dd222a8a00893709bbfc8b15249cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

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 https://bookatowncar.com/userfiles/file/mivexutididul.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/nepimona.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/207873820560fca21bd6809.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1715c86460---61636770851.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b1d86c080---433079779.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rafewusetokok.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/tazejud.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xozasuzenigodosa.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/45989313946.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a9984e3c4bd4be4847c9faa2eb9d3ed0/bofofakenenuzomuvewaz.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a58f46efee408c11afadea54d53ae61/wobijedalitamixotef.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/koloponogizolasirusi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae847d7a63e---kilusawotakukukokula.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/rexunuwasasanasimodero.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/84743104767.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ab920d545---jebefobabekez.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/widonevusamojuvobajeli.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210605002939.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/8044092810.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210802105136.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9eb1162c6---sewawiwe.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbecfcad555---pufebenivalala.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/29644442711.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nofipebe.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/68298861945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+esercizi+stechiometria+pdfPDF 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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 10892 bytes
SHA-256: 18a2d5e0763d059f28699a9c26246d88eb3db1e4b622325b1f5c03a12b1e88a0
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 18800 bytes
SHA-256: 214b860da1fc3683a8f7ac681761cf97366bfc208e2a403ab56df3387a92b628
font_02_sfnt_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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