Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d04bf02a1d0eab3…

MALICIOUS

PDF

92.3 KB Created: 2021-09-15 14:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9ac9c3d0e33c44f8088ac0120d05a4a SHA-1: dd1a680fd3946f2112f75addd4f062201674bf90 SHA-256: 4d04bf02a1d0eab3db3e2015bf92c56acddfd4d0d15e44b75e7e6796bf8ae0a6
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=cooking+diary+mod
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5f7b6246e55e0d75c67d45fbf42978da/24392021445.pdf
    • http://insei.eu/userfiles/files/62025327594.pdf
    • http://smartwealthhk.com/userfiles/97589366300.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/83986301137.pdf
    • https://baoholaodong24.com/userfiles/file/32586736892.pdf
    • http://mega-treid.com/userfiles/files/rupemujonokibogorap.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o6j5c18o1nigaufib3um0sljfa/lemijilofokop.pdf
    • https://thefertilizerequipment.com/d/files/muxodazexorasomoze.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/49616748487.pdf
    • http://savvyais.com/userfiles/file/reriledus.pdf
    • http://olymp-kiev.com/temp/fckeditor/file/bimonasuzibenudoli.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/povegebojezezixujebixixiw.pdf
    • http://mp-journal.com/media/file/ludituwovedoxabalibukovi.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/95197401082.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/podixusirinadorip.pdf
    • https://binarbaid.com/public_html/userfiles/file/wawepo.pdf
    • https://equinox-e.com/upload/UserFiles/file/84901491483.pdf
    • https://wrd13.com/force/file/xikibulizakuzatujebovomup.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af78fa71c4---28752212828.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/43386134882.pdf
    • http://theexplorerthai.com/userfiles/files/402688506.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d749.bin
25d9806548efbfe78da56efd027eaee77ebf4c73d55bfbc241eecff86c1102ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 23936 bytes
font_01_sfnt_off000113bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 16792 bytes
font_02_sfnt_off00012bcd.bin
e62cca045312918b292d130d6dbdb9eee357ae8462ef5226f02e869bf229e283
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 16380 bytes
font_03_sfnt_off00014266.bin
db81e20eb9cffacf2573089131ff148956da71679713cb3d4a0005d7c6ddbcb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 10384 bytes
font_04_sfnt_off0001599f.bin
cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1599F 1964 bytes