Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfab87b93eafc142…

MALICIOUS

PDF

94.5 KB Created: 2021-07-16 00:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8049395895c6371c725741f4ded7f3c4 SHA-1: 89d46f60fa56eb41344b025f58ba1594cee7083b SHA-256: bfab87b93eafc142659bc723c76e62a411c5e1e07d1b43bb285d2d301cbcdc49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://wastran.ru/uplcv?utm_term=ssrs+interview+questions+and+answers+for+experienced+pdf
    • http://asupuro.com/user_data/image//file/bifuzugozuxavekare.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d793bd1f013---7280452780.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mh9p2eblsrj40p37dcovakfh17/labowanolegozal.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee6bd405b---jotil.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1i369gp7q581hhqt2r6t6hta93/duvalujomilimi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/99c68ee6966b41d2d1dd0b2a63d99457/subedagalixodegibubirizo.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c010f59574556c91ca3a9a07879809bf/gatokupe.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hc4k7g83gi88v9p2juh0vaeegc/53691522961.pdf
    • http://foto-klub.dk/userfiles/file/nukosabim.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/acca0b0634bc84d8e5142c37c0cbf68d/kojuteguzuwaluweponuvitug.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93246480e---wisozawuxoxazuto.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608516ac02ae6---dazokebox.pdf
    • http://learningkey.org/userfiles/97921409372.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210525141944_553867379.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96e6e65d64---mugojizuxoxalusefonelutam.pdf
    • http://yacpa.org/yacpafiles/file/ferawexobuperib.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/evke3isoudhgbt051evs935bvk/23085591051.pdf
    • http://anupbolivia.com/images/files/32674216083.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46312501385bf29eca3d2bbd11c363cc/sijusisudumuparalupid.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/kipefajalujivopufi.pdf
    • https://urbanlivin.lu/userfiles/files/takonolonosafisojuwerom.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7a88507df0f88dbc19df9016773a0014/82485462677.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/lisukuvininexelijofutot.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735b696ce1d---38015083045.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d0e0995c---gukiburewafozuwava.pdf
    • 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_off00010b21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16792 bytes
font_01_sfnt_off00012338.bin
258f9363f5cc0ab65a4d741d5614160654b524b2f5dfb58f0db96d4e0f679863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 11144 bytes
font_02_sfnt_off00013d38.bin
4ffb81190596ef6209b19bc4b3e7541e908294c5c309a3d6440e7567ae62f8d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D38 17848 bytes

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