Malicious PDF — malware analysis report

Static analysis result for SHA-256 0517a7b5ecad770d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 14:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cd0cae8df26caebef860c632f6da36c SHA-1: 97fb8fdc5c878f650c1d8d25f05792aa633e0a24 SHA-256: 0517a7b5ecad770d704cf32d8614d6ed1d32679d7d2a5f6a66dac81fb6b5e903
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 disposable hosting or compromised CMS uploads, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.impactit.in/ckfinder/userfiles/files/kekinatodoxabimerepoxi.pdf In PDF document text
    • http://www.galiantsolutions.com/emailimages/file/53623758600.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/fojuxemi.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/topiwelajanun.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pufonorijevabemugu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b338911fa6---xurovifu.pdfIn PDF document text
    • http://coumert.com/images/file/77956166913.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/nineg.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/bavekepipiferi.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/sexebujexas.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/022a0eb036e7da59d2948dabe3cb1b29/doseviwojipezi.pdfIn PDF document text
    • https://slotpt2.com/contents/files/dotetoseritojatagomib.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ef39eb11f650c927fadcd37c29f2a0d5/litakogobabutenafabuvix.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/32881091373.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/lijatumazolexesig.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/42255481189.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/nilitutadazapop.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/tagedelefu.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/joxebuwazabujixoxib.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/1470832071.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/ravowetuja.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/sidupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=my+talking+hank+hackPDF 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_off0000c3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 20216 bytes
SHA-256: ff3217d75bfac9ddbb90fae36466e978bb3e7ef6b3f2c2c583ab4b6fd685fe26
font_01_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 10188 bytes
SHA-256: 7909f7a29fac7fe00d784df161ff67297b9dee24919eaf6090c8fd06a59bccf5
font_02_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1