Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cb7a00b3c15f7e…

MALICIOUS

PDF

77.9 KB Created: 2021-10-11 22:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f6992c91f614f13b5ca035b50ebd6646 SHA-1: 715b14678bb283066f02535b35dc9febe18dfc07 SHA-256: 33cb7a00b3c15f7ef461b27fb5b6d52adc1fe768e7d8aba3aa414b097e706fb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are consistent with malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.tramag.pl/upload/file/mokuwosufimokosawuvenu.pdf In PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/pezaxapadotebodaduz.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/67152654535.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/zapawusiresejasudajikolo.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dazepodif.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oglf44sm95k2337t94ej05edd1/62488159901.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/gifipaxerugazikalokumonat.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/40007592160.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/36021552713.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/8579184394.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/fepadozoloro.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/56409012716.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/51838986594.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0912e934a---18062975777.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/debunazamono.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/38894519558.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb26beff83---2994644735.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/sitadulomat.pdfIn PDF document text
    • http://freeorden.com/media/file/81508727688.pdfIn PDF document text
    • https://hojoairport.com/images/file/45050206410.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/46631444784.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/xokotuxiru.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/funurolosuniduna.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/kikigagodufotedatawe.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/12330941270.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/90f0da030b006fbf4ee3fd2a42d69b2f/pusifoduxoxojalaginowuvul.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-14-05-01-17-62.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=ponytail+with+swoop+bangPDF 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_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 10640 bytes
SHA-256: a0193eaf24d910e5e841b8af80f2e8a32d7d241f47014b1d85849bf571527c0a
font_01_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 18308 bytes
SHA-256: 2fa65f6b6c5721145e3290bcddd8a631e7295631d77e88447435ac04fb19920a
font_02_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1