Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3ffe8123119ed5…

MALICIOUS

PDF

99.6 KB Created: 2021-09-07 15:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fcea0ad9c58aa24126f76500e903b0d0 SHA-1: 92c272dad2d392f3a8043ead07f4967b319ccaad SHA-256: 0c3ffe8123119ed531b7971397a805bf992c10122099f9802cc7e388c7634125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac810513f1a---96128996610.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9909bc49---vowurokujebekalone.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s9m3p4b9eld9tdofm1j9vc36l7/zanagefawuruvamifijawiv.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kqgih6l0lc7pg1orl7ntm146n7/xosepigezugolavo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca52b6400---vojobudimugidururupuzi.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/zufexixuguwubipolofof.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/duvaposanaxosaxovubetir.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/murejoko.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/39287a82e858c1e58b6d184c42be96bd/56761110536.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/adfb1936d61d8aeb619bcd90a5fff7e2/34160686918.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/88532696944.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/debuwopuzerafukugijowesu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lesafaduxifas.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/13664776469.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/85799152138.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee338e60---ruzubagaki.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/42f7e1f95bd200a15c32d580cce89637/divigusamonej.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/24332992545.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be763dc7a---xozovejenovigotegogukun.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/13634421049.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/lurutimajaka.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbb7dae913---jejetilugatilunusubiv.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/8099312721.pdfIn PDF document text
    • http://guchenes.com/d/files/wijijolologibuberibaro.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/purelubazogubodamep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=human+values+education+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_off00011c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 19420 bytes
SHA-256: 2c625f37814721364f4029a75e286ac9019ea81dc8be82d575903b0d40904af2
font_01_sfnt_off00014f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16772 10840 bytes
SHA-256: 7b80818c6e7a37de4e089fceb0eed97040e589520d1958534d7a21e1c4a2d2a9