Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d755d49d0103146…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 15:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6bd9c17ba742c1d92d1780d636431c8 SHA-1: 24a7221f0de5b72825ac0841f1069f59a5aa9f9b SHA-256: 4d755d49d0103146bda284dbdeaf206d3eb05210e39898c04296a4d69d481292
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 an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dljkolmeter2ndfna8m6siv86u/64690621762.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f9d2c9eaddb22956c47a91847fc5eefc/48636305724.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d6aaf707e2c7e47c790e74fbf3608628/82219803403.pdf
    • https://zahnersatz.pl/userfiles/files/lezufelagajat.pdf
    • http://nicenpos.com/userData/board/file/2179750343.pdf
    • https://wickedcheesy.com/images/file/68988470869.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/h2srhukgqk2si521ratgrsfeb1/12433375751.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078c87ed7096---90490494012.pdf
    • https://cytairtool.com/test/userfiles/file/20210618_b0e68.pdf
    • http://mabo-meccanica.eu/userfiles/files/47372321322.pdf
    • http://bezagsecurity.cz/userfiles/darotavogobe.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lotogus.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/59906328362.pdf
    • http://hasdeu.md/data/userfiles/files/xanusokitag.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/93755988268.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r4i8nt9h8dnqli5ud37srcfm74/zidavamixesitaw.pdf
    • http://kiiga.ru/userfiles/file/56828690780.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aafee47472c---tapasitununeranem.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/bhbnj3p4k49revr9p426f8mkvn/tuxisakofula.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/zuponuwadipulupovitovez.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/18f0a5c49db5859b855d0dd7ada3e8c6/44181953250.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/492b003a5a3ff645265a10aef362bd2f/28690103825.pdf
    • http://lubrifianti-auto.ro/files/file/wijikifokukuxorozoxo.pdf
    • http://gayaarchi.com/userfiles/file/20210802074133.pdf
    • http://absolutelyneon.com/userfiles/file/73378939731.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=when+a+magnesium+ribbon+is+burnt+in+air+the+ash+formed+is+which+colour
    • 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_off0000e406.bin
9879571da7b851285fdbc9038f02ecf7965edfcc7c6e881b775b8710cbdbbae3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 19056 bytes
font_01_sfnt_off000115cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 16792 bytes
font_02_sfnt_off00012de4.bin
addd922454ddc8563a1913521b7bb758253ba05c083f0f9b9758dab7aacfe27e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 11240 bytes