Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f3c3a7cc95b3c2…

MALICIOUS

PDF

79.2 KB Created: 2021-07-05 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79594950e69db7ed5715d4817a673a6c SHA-1: 77dfba55ea4b6c9092de5cb38aec5da8b1576424 SHA-256: 11f3c3a7cc95b3c23b7c05e4959f00826ce613df2e16eae7ef46e3494e13d76a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=protoplasm+is+a
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/09ee0cb533cb4f618c2595670c97bd3c/6259849411.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe56be048f---ravubawujixug.pdf
    • http://bigdoughpizza.com/uploads/files/22936839577.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e9312ff6---54890283610.pdf
    • http://energo-market.ru/sadm_files/31149430064.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t7j0agenpuheat0m0uf0si2rv5/wosubagigiresibitofun.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/999364b1567ed0b5df54e2858633f724/73213040720.pdf
    • http://cathayred-csr.com/img-cathay/files/bazozinezirowi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607780374ae5f---tefon.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab830835a---6863487269.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3588e64e87af972ef96188e4a5ebfabe/jimebililorenogasotala.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd199aa08---38618497878.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085440d26df3---23757517007.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3818f52d6552558543b1f848c3021dbe/37717826816.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb81cefe58---kiribamazozudaworepolite.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6deb153c---lusunebasevile.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/le8mdh3ph6461nq4vm41f9hkm1/wewusotutotokagikerapejus.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0ed79d2eb5ca3d257514d70c51b9b420/gapufafexeli.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e47346cb163899ad41680f615190b794/mowevawik.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a740ce81475---vabudinoginaxorujikuzesa.pdf
    • https://accu-split.com/userfiles/files/31342869072.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f45137d07---22976490590.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee47e42e1---80665196392.pdf
    • https://rhodium.vn/uploads/news_file/56735013941.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_off0000d353.bin
eb670bbc66123b96cfd46cd9f2b4816db92705a0e63f83bd1a8d76f88a031266
pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 10180 bytes
font_01_sfnt_off0000ea1e.bin
8f4bf66054e5c44e7735858e4f39b3aceb84487e4ef3d36515a82130e4c7857b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 17540 bytes
font_02_sfnt_off00011804.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 16792 bytes