Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec9ac4db54d1477…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 11:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 134fc9ed05e8f1b57b96d8b31e6c31a4 SHA-1: b02a701e44f454b5185d792300ef0883da2387f8 SHA-256: aec9ac4db54d147762c74a0dc5b030bac56ddc9e43fee5875f57b3dfe89180b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be to lure users to these compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a7dc5398---37914740611.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3b5ee9c1647498d8635f60997cf14739/47230939240.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2ima2dm8t248e8ua71cgpj3m22/jujutuwukuwepe.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c4e2ate2hvoc5tls38duh93km5/vilexokes.pdf
    • http://vizcsap.hu/files/file/82087844459.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/jvpi85310s6smvica0k5lpmi14/pubatofutibemulibawiri.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf7a41f6ab---97018799227.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c74a15b4f---muzaw.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715c703416e---tizexibenelet.pdf
    • https://aucordechasse.fr/vosImages/zonasebuxitorupetuwep.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/mboq65sosugdboq768gtdcjett/gasavodapur.pdf
    • http://iwishop.hu/file/rozopegowowuliloferuv.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/689325262ef77b778da84e792a5c46c8/81041011365.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ade25c6ee4f105c9d3d06593817fc571/lemewatadusawak.pdf
    • http://mbcasc.net/imgs/file/tepurewamozapibafof.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/50483957920.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/83332073247.pdf
    • https://fasaac.org/temp//files/12475366730.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a836286b797---simemonix.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f7634c827---kelavaxibaperazenefuxije.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=parable+of+the+wedding+banquet+meaning
    • 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_off0000e9ca.bin
4e018ccdbf195f876dc52fc5d0e0f34126008161c053bf9a103fc79a3de0b987
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 11108 bytes
font_01_sfnt_off000102ff.bin
5a4950a550457c497cd6645c41b0f43fb4145c37fadd8d798d39f781585d5c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 16540 bytes
font_02_sfnt_off00012e04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 16792 bytes