Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1a89fe31a152db…

MALICIOUS

PDF

96.4 KB Created: 2021-06-26 07:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43e676185727d56435e1c119f114d1db SHA-1: d25b3913d2a6fe5e7856909c0104a16a89789ac4 SHA-256: 9a1a89fe31a152db8f1787a2fb9716a1024378da4c633853c7f68b1d611b6ab3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 https://infrive.ru/uplcv?utm_term=so+pillai+solid+state+physics+pdf+free+download
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/85544313698.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841397c47c---janubonezimamovijixixifu.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608932cc1ba7d---lunijabakupev.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a804349a---90588632969.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc38cf449---laligugagunijiwege.pdf
    • https://prosperitas.be/data/assets/file/55367777425.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/31976de05c7bccf4f47045f2f50ae42b/42650555687.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade99ad71a---wewokat.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8454262d1---52050720406.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f9b5b8bb---88435544333.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2d478b5c3---80627434058.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1nk8t0nkrqtlpanu054gga44iv/bujunukid.pdf
    • http://xinyuemu.net/assets/202106/files/20210618112139941261.pdf
    • http://iberia-ex.com/images/blog//file/baverarigewu.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/87764418229.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160976e364918b---70052573455.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fecd8b780---gikub.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c7c3f25a4dbe2b2cdd519ee26f27f696/gamusaxijovuwenajizujoruw.pdf
    • http://www.bash.cl/media/file/52041095295.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vcjlbc7pp0elnagtvika90p1n0/munopavaxis.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e33e933c---roboruv.pdf
    • https://himalayanthailand.com/image/upload/File/satatutofopebaxi.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4k9ob7oeh9l0dq4u2j38070md4/gupulejogosedidideniva.pdf
    • http://geometrabottero.it/userfiles/files/xireneful.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/76353150179.pdf
    • https://mediaget.com/userfiles/files/xisajaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 16792 bytes
font_01_sfnt_off00011605.bin
a3e08b4d476a5308b10b147022e3b1207fcffcbfd974026f1ef0e41020795e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 17552 bytes
font_02_sfnt_off0001441a.bin
507451bb2625f2be0df06f06a9886d71179112e6bf322cf039ae9dd87107a3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1441A 10992 bytes
font_03_sfnt_off00015da0.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA0 16140 bytes

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