Malicious PDF — malware analysis report

Static analysis result for SHA-256 f297a4acc57d312c…

MALICIOUS

PDF

79.5 KB Created: 2021-08-29 17:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a3fb2ce110d90b7dbc5cb2685bd516f SHA-1: 46c056de251b40f9fed05354d2884a065f2e0ebc SHA-256: f297a4acc57d312c1e151e9236410e5961a1e10f27eebe0ec58e27f0e6e44c48
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially untrusted domains supports the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://donovaly-ubytovanie-safran.sk/web/userfiles/file/55017622343.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0544a4ffe---vazevusas.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607354dc501b6---kakaxirivogofunex.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/nixakufunileje.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/relex.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/62479554208.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//36839584180.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/78797954996.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/voderogunajegonazo.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/64732967607.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/190246147253.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/35076642718.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe1bc4edc---segopojurusug.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9717938fb80be1a4c5383c437325b795/32135573074.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/29217077140.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2a2df80d0902c4abbc891501439b16fb/gipojezodorijuzaxogaluwa.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/resuwikorapalezonebotege.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nujiwumutotemoket.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/70003618.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/13413964989.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d839490dfc---ripozojitarofi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/19fa92b22147e417dc60ee712845a16b/fuguzupa.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/fexifegetajixovekakaki.pdfIn PDF document text
    • https://mytopics.it/uploads/file/vemazumabajufinogomi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f600c2af6---zejepix.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/78646433024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=online+pic+to+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_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 10208 bytes
SHA-256: 93cf4a87b5b8d60d64e825baeba4388acef77aafb1b57faccaffac16b03f65c2
font_01_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 17336 bytes
SHA-256: 856d640393e8d9562e0ef8606c77e7ce1a809aa5f66cf533f8a2820c374e05bb
font_02_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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