Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8347bf9431fbab…

MALICIOUS

PDF

115.3 KB Created: 2021-07-05 05:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84889c21046dae2f47f223c56b5ff7f3 SHA-1: d99bbce1f417808c2912cbda81946cafb86eaa6c SHA-256: ba8347bf9431fbab84c83e533d13495ce54f7f15af22df3533e68f55ef002c5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable binary data, offering no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc90b0b85f---72196117373.pdf
    • https://cplastik.cz/data/cms/file/69667511043.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/e3seg42aqot4nsfdr00mds821m/78836345750.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fl841fggd9jabkai6jf1pug2t2/17186189147.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1f7c8a5a7afdca9e5f649afe1a1a3092/memogaguliwarenukuxatide.pdf
    • http://sp3siemianowice.pl/userFiles/files/19368793439.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160791e3a297b1---pikasava.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5ae2905kr12gf6ad4ud1ujn12r/14827920318.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a781af2414e---kuguvipuzuwegoxuzuji.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1206ff023532ad8e3fe1e205f59ffc5c/napijatikavivef.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42df6025f---rixofumesetezi.pdf
    • https://juvelyrikoscentras.lt/Files/file/tigutamimajugol.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4826095ae0---jefiwujalopobazatiwibida.pdf
    • http://uniquehotelsolutions.com/files/others/geraposo.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/sonerujiralalifemavofo.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091895559adc---81503412558.pdf
    • https://healthmatters.me/userfiles/file/folazunemenaxup.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab032b90439---92281188984.pdf
    • http://softtox.com/new/userfiles/file/butapezawuxapir.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/vopewoxuluvefinelimow.pdf
    • http://robalton.es/Albums/images/file///fidirunakazibedotuzomowu.pdf
    • http://asesorgubernamental.com/images/file/rirofivetukafidip.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/097771b5m1ticoav3hmsa74ml5/gilemenapokalisavuti.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cccea2c63---9377123447.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d646758dc63---nuluxebafakosifavem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=easy+turkish+grammar+with+answers+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_off000146fb.bin
c5f259204cdae6e90c9066a37dbba484f9673797ee738c8af51d121ada776b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146FB 11156 bytes
font_01_sfnt_off000160ba.bin
5d5b6656f436c95b620a60778863c2fc81814c2e60641d36c2cc96d7c7f5d164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160BA 20012 bytes
font_02_sfnt_off000191e4.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191E4 16140 bytes
font_03_sfnt_off0001a760.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A760 16792 bytes

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