Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c43d4ea6b8e8a0a…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 21:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e6758af595aebd7cc8fb3085611f8f3 SHA-1: fda83e567f1df51679a1c653ed13a4d3ee8a5ad0 SHA-256: 3c43d4ea6b8e8a0a7c57ac29fa4fa2275937f5387868f7d5921fbb950c29f4ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage download or redirection chain designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4fac38a48---29912066938.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0adefe18---6843059037.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d796848385---75784332040.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ca99fccc---fidesoga.pdf
    • http://metaglas.kr/userData/board/file/vekawotirowosemojepifixog.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3uku661djg3ivblljo2ckgegee/75752754999.pdf
    • http://rydelko.pl/userfiles/file/wolurupekabafusojoze.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/jemam.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098466fb6694---vetojizabab.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/25832425782.pdf
    • https://exlite.it/ckfinder/userfiles/files/75931831218.pdf
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/49726792026.pdf
    • http://radissonhoteltraining.com/userfiles/file/61775841619.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9139adf3d---minujijubixobojeru.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7cb6701a1d240bc693962e5b9f2af3f5/kaxixexanarexuw.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba6a16fce---gokipe.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c46a4f05f1566dcca28a06a49030569a/miginamemasa.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76d78def7---15531883137.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/murol.pdf
    • http://ferramentabelleggia.it/public/file/domuforepiw.pdf
    • http://ketoanaca.com/uploads/image/files/gugidukowosodozofafosalo.pdf
    • http://csc-021.com/userfiles/file/20210617123319_1cp4b4.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c70abef23---jafatot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+record+in+snapchat+without+holding
    • 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_off0000f0b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 16792 bytes
font_01_sfnt_off000108c3.bin
33a6280a12feab0ff6278a32ec1a0e796eb2de144ef3b01c4126181ebf6c1544
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 17596 bytes
font_02_sfnt_off0001366c.bin
beb635aa7a271940c0958232b7d32dc8927f4200113e983df4e0d84ae595776e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1366C 10968 bytes