Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b2c8da20ba8e13…

MALICIOUS

PDF

81.0 KB Created: 2021-07-20 21:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54a0feceefa02b086dd4860b3b77cd3b SHA-1: 3234a961df380d0fd34f5dee98defe590e575054 SHA-256: 45b2c8da20ba8e13b8fc0aa9f3691df9a6b94eed9afcdac58fc8ca48281bcdae
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be79cfd4d00---zuxekagoba.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9375d96b11b78a337e33235f5b73d130/zixujixe.pdf
    • https://harom.ro/files/file/momiwezegekak.pdf
    • http://versobrokers.eu/userfiles/files/xizawimaxopevuramatupeg.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2510060d64c622d1feb360554f3d9314/pogixatifasowumusagamuj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb66cdd42---75261418369.pdf
    • http://veronikavilla.hu/userfiles/file/xagozizadodubod.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e3f21f9d5161244c2166234ec40b5ff/feberubegeka.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e282858f---jokokikawilusenarus.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/76e2dae444fbac8ea4e5144bfd34771b/19410183897.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7063c5f6---bonepexupepalekoxuzokawu.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0aa4672b738eefb4e7df6c8e7b12ada4/94686168404.pdf
    • https://charterfori.ir/basefile/charterforiir/files/70590003825.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ebb5d9d03---21373649492.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50b676ec2---43007448449.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lh0nr8543atuvogc2h1p9p650r/lofimapeti.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d77ff957a3e87f4ea5b441ca8498ffe5/91868445533.pdf
    • http://altelaw.com/uploads/image/file/furitigepulom.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e7289365---wurunage.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60496d33b8---43552208264.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c639bd2f5d5---82995117757.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7f23ba041f5dd9aa97173113f9d949ef/87943758112.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96ad5013a---pifugitipupipu.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/10c4c1aa851966117365c684c0fb1e61/nasovadavupawenonemevupa.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c8ae80c4a53d597167fd3fb40aef5287/65383358864.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=1003+windmill+farms+blvd+forney+tx
    • 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_off0000d5d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 16792 bytes
font_01_sfnt_off0000ede7.bin
9ac3a345a37519317b07c0f8803ee273ad52ab2039bcf865c75ce06d050b5b80
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16896 bytes
font_02_sfnt_off00011a3a.bin
e59f5aa7859945dd30e99f11c4ad2657ab8dfebb9f7f884cb8bb374c6fd983b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 11272 bytes