Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aba5645e99de4f…

MALICIOUS

PDF

96.9 KB Created: 2021-06-26 00:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ed40598952ecf0dc057fd53c17dfc41 SHA-1: b0f97c667a523f1bd0a8556a9ea3228c21dd1da1 SHA-256: d6aba5645e99de4f1318f45e54596be553b93d5e965086f06ca0a78e834fe35c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of numerous links and the ML detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://allytemp.ru/uplcv?utm_term=veggietales+ultimate+silly+songs
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf226643d87---sobakigefi.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4dlkhanhq43g2nq8dt6b1stl87/23133719375.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4554077f86---29306995070.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/904233b47a4287fcac927500d3a5bafa/30238887069.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9990ea2e---68092451211.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d657074489---36036978694.pdf
    • http://amphorabeautyclub.com/campannas/file/61217037697.pdf
    • http://allycatering.com/userfiles/63990129527.pdf
    • https://beldaoyun.com/calisma2/files/uploads/20936534227.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d56097372fc9f010a4a35869f32c4e88/lenamirixodetafoxafe.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d063b1cb---80497032419.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/34e29508ce7eb58993b74cb5d5b25ce1/19884847191.pdf
    • http://volamtuyetthe.com/userfiles/file/vemivekogud.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/akjl6vro62kklns1ve2ja74h4q/78388159976.pdf
    • http://pinetreerealty.ca/clients/55933/File/zidaxewutujome.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160922e36ee437---70527903704.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/35qmma74hpotutadthvsn1esu1/63685022073.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/8v5u0fp4da9kq7to9ktoi5gqk2/nuxabexolotovedigifalixu.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160be96654607f---36284819767.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dabd43d1f---wudokixutezigodu.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5e20ceea6258c52e228b278b75404f0d/maxidabofoviwajovif.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3774460f3---navevopozufekubu.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5hs9se1clk5iq7e4bnq3h6c3b0/rawexabeluxapejanoxuli.pdf
    • https://adreshosting.com/calisma2/files/uploads/46344540479.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_off00011754.bin
537973b36401315f77ddad654230b21763a0374f07f1d562a1a9d54e1e53189e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 17868 bytes
font_01_sfnt_off000145fe.bin
28a520e86b9bef58e56a5ff4242aa59908162e23fddbe66e1b566192b650128d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145FE 10532 bytes
font_02_sfnt_off00015e09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E09 16792 bytes

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