Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad01e09669c8aad5…

MALICIOUS

PDF

81.7 KB Created: 2021-07-06 19:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f1df850582240c5fc5ed150a0a2a21a SHA-1: 7b70bdb70a333a7277ac4a659df08c61a3063610 SHA-256: ad01e09669c8aad551fcf46b91dbccdb304225d9853a4b7b89e0a465207ea7ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a3a80dd3---lileredi.pdf
    • http://gfhs1978reunion.com/clients/56625/File/43978354993.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/46222820969.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e596c802e---49899528075.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/080b5bbce9a170a34d12217de84f7b98/nerasexuvanexozulo.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df02df685---sunubofo.pdf
    • https://anmimar.com/royal/userfiles/file/31327551291.pdf
    • http://samurairamenbar.com/uploads/files/fatojezamipu.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/90b177835fdc621c2bd198607fbd1136/puxozarosonisatusijofik.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2780c52f6---47352156389.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/f8c10b36f04a1db9679408c8ab84d865/28922789634.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4133b0a69---40497898767.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8bbc57116761f7cc750169712b8d86f7/xedunapub.pdf
    • http://mmckno2010.zkosuchdol.info/files/nofesokakirukuboleruf.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f070afb0---galunafo.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/194f95c20b7af68f984e6cffcab01696/49336777734.pdf
    • http://veterina-hrib.cz/user-uploads/files/simalexufefofizepawawesu.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c88df9c2---zufenutuze.pdf
    • http://mobydick-band.de/fckdata/file/49260042593.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a268f70d2745e673462ed981688a53bc/dobewepafes.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tt7m5a4tg4gj8g8ever4apemo1/bumifenupor.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/210185b3f47a38a926968e3d59d21338/98694837553.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3bfe6187---nisaro.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/74755188c9a662c75b884e2b8976cf68/lokepofolazetafuxibamef.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/92j6g01d4ciu6o42ve3551kher/zasomepakumaxe.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9fe3ce4f---54824466521.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fig+and+roses
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce66.bin
f97de61f68e7e2ae8397072ae7fe51b53fc7bdba677766b1f2adb46f6f4e2ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 18344 bytes
font_01_sfnt_off0000fdd7.bin
eb6669d4129fbe0dbb3046c65d917c2b6bb2479f795d50320b52a8d769669f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 10256 bytes
font_02_sfnt_off000114bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 16792 bytes
font_03_sfnt_off00012ccc.bin
ae460062de3556f6ed61eb5a10138113086876511c384f3b0bcbec4364de1371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 2448 bytes

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