Malicious PDF — malware analysis report

Static analysis result for SHA-256 4626f897f569a0ec…

MALICIOUS

PDF

102.7 KB Created: 2021-09-04 15:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 469ed4501d1bf6712f772fd95c7fbcdf SHA-1: 0b312fe83ff78941b50dbcaba646b76ab17a8be9 SHA-256: 4626f897f569a0ec3ba0429f6af6aeed8716f655fb302d3dbda94a1a0175fc9c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://goldnumber.info/userfiles/file/jexagisil.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a24eb497f---joturaranorijukurewagoluj.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/95247906270.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///momolugudokolulibeda.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///38439801121.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/didise.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fcb920f2c---jowujosokuwitani.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b440cb0b305---jesisegobel.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8c2db0445ec4961a2c34a2b59a459335/31916641026.pdfIn PDF document text
    • http://cecev.com/stockages/files/rumirujexosavi.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/bosalevidukovit.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609406d12e7c6---vudifumesutiwavubumejiwed.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vemexagupazedut.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/kavuv.pdfIn PDF document text
    • http://rts-3.ru/upload/files/26305551307.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a96398dfec1597a262375f351404e591/lolusajadupo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/6401062780.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/vizozuwamamiwixulovasu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vopaguvewovuvufaxemixiwer.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/53344011941.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d1f16188c---78962643510.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/gisapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=actuadores+neumaticos+festo+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_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 19356 bytes
SHA-256: 03a12f0232e828f99b3a826d21a10232ca5a6b95de112f5192b12b0126a22957
font_01_sfnt_off00015c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C41 10816 bytes
SHA-256: f159458d5aa90cb9b49a5520523c2e151d19611177dd08766f398b38d683aa32
font_02_sfnt_off0001753a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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