Malicious PDF — malware analysis report

Static analysis result for SHA-256 8726ce113c96195f…

MALICIOUS

PDF

99.6 KB Created: 2021-07-02 06:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07ddbb6a30c654edf380c9137821fe6e SHA-1: d31a42af818a478a3674767e5537fa6a69f7ebcb SHA-256: 8726ce113c96195f535990503c39c14d168b9033e941d247bd56dc67c3eed600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://garglob.ru/uplcv?utm_term=mathematics+for+economics+and+business+ian+jacques+9th+edition+pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/788d5fdc7e44b55fb5f2e640738f718f/fubowokawitobumukad.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2265343b0---36023750246.pdf
    • https://harrisitalia.it/uploads/file/zodefetoxoperiwizovog.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfe11da45a---lavonilofinoluwelebir.pdf
    • http://www.findvoters.com/userfiles/file/rosutebugovivikogome.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/67e5a5497ad45d15ee516c277ab54016/gozarunagifezo.pdf
    • http://cn-polylysine.com/d/files/vupizu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3c61899682f10c0bb42ad342e3028f22/xululajupupozidiwumerif.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2691cdef0---70646466440.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5f48fa00---9609762147.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2beb3db166---26981808598.pdf
    • http://moreit.ch/productinfo/file/28438998728.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/84au3c9u2g4rol95ki4ois4vh1/16972008343.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609179b372a7a---wawexebofawujup.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823f0fdd480---renufubabuxezedokofudut.pdf
    • http://ifa-astrologie.de/userfiles/file/xawudegesu.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d56603010b0---buxivaveturikefenonitew.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca98a8490---fagesiv.pdf
    • http://jatyn.cn/upfiles/202105/file/1620963535.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077418e02616---60397871925.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f0b223b70628714edf857bda3a97e980/tefaxib.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_off000106d9.bin
6da649fe2c990e5dbfec8295bdc1e774061789fa48b31a604d630b927bcec73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 18736 bytes
font_01_sfnt_off000137f3.bin
408ecf8d35501c7d4497271c836b5623271421cd7799ea026efe3cc841317f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 11516 bytes
font_02_sfnt_off00015297.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15297 16792 bytes
font_03_sfnt_off00016aa8.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA8 16140 bytes

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