Malicious PDF — malware analysis report

Static analysis result for SHA-256 267c17f0d42217d3…

MALICIOUS

PDF

122.3 KB Created: 2021-07-05 15:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 421fa0e33ab29df9d79513bf1c43f998 SHA-1: b77d63d75c93d48b76fbab7d4a47753674b1db18 SHA-256: 267c17f0d42217d32aaf9c367e9e438742a81a8c271f3693e23e435f9d2b3971
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://xlsferrosilicon.com/d/files/82778615591.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae366ca435b---serukepeduper.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca47bb647a---nowusijasesiwagitikij.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160810a0f7c4dc---17854024615.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5e9dc8fc5e585d18be0bf97e139a326/kukemegunolikuj.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ccu1ia8o4etjf8mbl31nk9ggu7/jogumarujafimex.pdf
    • http://thesetnews.com/images/fckeditor/file/rovuz.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/np35r1h37duonb3t4674irtq8j/91613630040.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/28305e97052b9d8bb6bb535932b8b54c/lebusatajobewujezuri.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da0ab54eb12---95633018380.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8e965beb14faaaf7441b36b46c61311c/jakazemelabefete.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93aee79549---53757547377.pdf
    • https://shop-ecobati.com/medias/upload/files/1002720813.pdf
    • http://bannhuaduong.net/upload/files/vejide.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1968579007c8aa410d15a9ab6adbe5a0/zibirirumog.pdf
    • http://brenno-tojestto.pl/userfiles/file/dagopafizopixaxafevobosi.pdf
    • http://pagyesa.org/userfiles/file/20210623003805.pdf
    • http://fujiya-la.com/uploads/files/63290894468.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb08a483c1---madumubepanovekozigowopi.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b44d7m9hibencb9nelebi84nm2/25533806503.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc08f70e581---xojutilikosudeduwedu.pdf
    • http://stihoplet.by/upload/editor/files/38040258439.pdf
    • http://biaikatolikus.hu/files/file/kinadixawominota.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160903dad18d74---22036854142.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jfbo1mo7pk7b148ghsajcoaie1/zovetajamoju.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7807ffbb---rusolukuzudazusimanilowe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=merchant+of+venice+study+guide+questions+and+answers
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B06 16792 bytes
font_01_sfnt_off00019318.bin
902798c6cfb615a9820d78d91eeb8bd8be9204d61ac5a7bf5bd07caf0c35af7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19318 18136 bytes
font_02_sfnt_off0001c1ad.bin
68967ed0f60222649cb0e81c17d7596401509a19a539eae29b8b1496c3962cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1AD 11212 bytes

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