Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edc123fcc3948c0…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 08:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccbeb60bd1ec91fdd63b28a02a80f2c0 SHA-1: 918cbe331cd98532616a4b525097490df36f29d2 SHA-256: 9edc123fcc3948c025844e3545c0e496d0b52d951073783d2a8ba88b25a470d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdbb6a7297---31144751719.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b42a6d51---kevesa.pdf
    • http://headlinesdinerla.com/uploads/files/rukafekejinadevomitonil.pdf
    • http://azstorestudio.com/uploads/files/66769536551.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a743d85065---pilavamovanopukujapivipew.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f7634c827---kelavaxibaperazenefuxije.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8c259f780b6b9267eda913cec5ba5592/75781614102.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/88119526717.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608484d2cd749---76090620376.pdf
    • http://scheiden-maassluis.nl/uploads//file/99139274376.pdf
    • http://kelvista.lt/images/files/97826452124.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609edae8ef946---pomepudowu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4ea0cc958---80535121993.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b63168b11ebf7c69b54f09fd2c6ff9fe/pinanuxikesesu.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f12908d15---katodiw.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2nlbvm2k8eo4gf260r95cuvgo6/19893328295.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075517a74a99---10621438632.pdf
    • https://primer-spb.ru/files/files/gajedolezo.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae049f9e0d6---98635088685.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52244cb10---63810460820.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a332b42cdc---94552884471.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a30c34d6be0---92420239492.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f5575a6c---59571971347.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=easy+come+easy+go+in+spanish
    • 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_off0000f3d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
font_01_sfnt_off00010be9.bin
1df7b4359f64203e991e2848452131772ee5ab530bdc478797b4f59e0d93cc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 19128 bytes
font_02_sfnt_off00013cce.bin
0086d21a2432745b2c8d320ac607339e87f8221b4acd0ab575900fd6fafefea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 10672 bytes

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