Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa709da84c57638…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 17:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83e7482ae94d50b6dffaa9c58e3d9432 SHA-1: ca57d443d72be6f335652581e483c3ade6ddaab0 SHA-256: 6fa709da84c576385df9b32a3bedef380ca0057f8dc39c5aaa18637739671256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.specemc.ru/upload/files/fedut.pdf In PDF document text
    • https://dottoridegregorio.it/public/file/jifagavupuwejadazadeg.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wonefidemefi.pdfIn PDF document text
    • http://retailcop.ca/files/napokefenipikukovikok.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac026ce6a---fuzazodetimarewepulubel.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/nelibozasevazopip.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/bufawijotasu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/91222781615.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/danusagu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9426b91c3---sunobejeziruvezabe.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7083264003737d825d793f16a1f6313b/4421210763.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161355a7feb744---nafax.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/reberekukubesulij.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/3062747006.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q3uf1pmg6bpfmpvf5nna9vi2a3/kojudepirupuzapoxokeval.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/54944310068.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/32248890691.pdfIn PDF document text
    • https://patc.fr/imagesfile/30825278863.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/burizolo.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/jitusefi.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/36550307875.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/bumogojorakikokerakebadil.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/94440841151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=obstetrics+and+gynecology+history+taking+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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 17004 bytes
SHA-256: a46e88c19a92cdc1e09973f24ffa04f3e6da9d0aba3d4e550b666cddb942d074
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 11268 bytes
SHA-256: d5f566f36f51ba8263c54bf974e140d95f7cf263971b4ac9e85785e515af8fb4
font_02_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1