Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e203feaa8b6f0f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 22:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4732116aeeb152c7f76aea55775ede32 SHA-1: cd595f4e9e47fee819d45ee6d13765f07c935eb8 SHA-256: a4e203feaa8b6f0f80df0e110d11c52a84341dfd432be353f78c5d93a85338b3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. This suggests a phishing or malware distribution scheme, where users are lured to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://orgue-chantepie.info/FCKeditor/upload/file/98897141142.pdf
    • http://bajajsports.com/userfiles/file/jogus.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2b9dfe42b19e36864290682fc81d161d/784984428.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d354e93df1---fowoporagutizotaro.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/2c6ff3eb3cdc2d715235f063bd71295a/mejizaruru.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/md8vv8ekd1hgt5n4p89u9pojg2/dikemamaguvo.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/tuupjgufsugjknmmleom8ffd5b/zedada.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/25052980779.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1cfd5b57d---gevonetodakegolibuxojovi.pdf
    • https://siahotel.com/userfiles/files/xixamaguzobemolewesat.pdf
    • https://steammining.com/userfiles/file/71350210905.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a366e80a8c---bimuponejigajuwom.pdf
    • http://www.heksan.com.pl/file/berisezoxiruzozowi.pdf
    • https://open-call.fr/uploaded/files/silepilegixavixozuxadoka.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0929807262---lefavetuvukufokexamabakek.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecba2c0afe---35245694230.pdf
    • http://kojeneckezbozi.eu/userfiles/file/12655004063.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8vj8ia8bbge5ds3qrke7o9d92g/koxewari.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/38n29t0ho73q7s65o6gdnoj0je/73127658540.pdf
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/42984662698.pdf
    • https://vestol.bg/files/file/pexogolajato.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/169307965ac90621abd6bfb41a7bd479/86935091050.pdf
    • http://dush-kz.ru/uploads/fck/file/58530193434.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/v2eqf4a8f0plhjh8mt1lr1ufis/dedegiw.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/08a2b3bf1f15cd16797a4b194c1bdb3c/57598266945.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chess+openings+online
    • 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_off0000f609.bin
cb3418d371ca09d0f50336f3e761953d1935afe9403581a537c8eef23c369825
pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 10204 bytes
font_01_sfnt_off00010ccd.bin
6eff1d370739fde36e2fe95221e5bc233d3985a2b411e8eebef6c45e47eb1fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 18176 bytes
font_02_sfnt_off00013c92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C92 16792 bytes