Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a703bf78c89167f…

MALICIOUS

PDF

98.4 KB Created: 2021-07-03 00:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c0b57edc95706b6ce3dee6933e2ae062 SHA-1: 402be6912e19c6bb098b09d17ab5b75539bb8347 SHA-256: 0a703bf78c89167f387e852301ec601f791fbfba87f756e79c501e8d1427a97b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malicious files or redirect users. The presence of numerous URLs on potentially compromised sites reinforces this assessment.

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 https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af80ecfc61---konijudono.pdf In PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/72aa8ecbb98e16ba95ecbe919aee54d0/2455422340.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5b4483868bb5120c30cad5e522722985/lubogaparutageb.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbad12178a3---kazuwagif.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rowewonulukebonesal.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b6a2c826b311e3c0f632161db3cca9d3/taxirovimagadodad.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534f483b19---dobuvototadojugibeji.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/50c2492a57018c3872fe5058565b7717/5214779281.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nuvurubavafuduvapewura.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sujedujefekidewamo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6b0bcff08---lawizami.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/60d90450bd9b53bdcce53e63e52df350/13915976298.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/abdcd22f8c24b04f51ed3b5b999504f6/58976397451.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608566007f48a---75639586314.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/gewarifawidom.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fa52041913f0349c585b589b9696322e/wajutodisasutekijitesukaf.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/60315857347.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ba0311ef---jukelukejilu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608337132752f---suruwunawuvolesuvosavibuj.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fupedogabaxasajan.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mcuu8ue4hdrpb2pfsvedqmmc2u/21703130641.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/jugunidetaxavata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=title+9+collegePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 16948 bytes
SHA-256: d9ca2604b52bf55960b9722c81ff54f234ce4f5efeebde1eb81e85f3f906f323
font_01_sfnt_off00014e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16692 10000 bytes
SHA-256: 8933eb9696ec8f28d1529801662cb6d1e1c1b9bc2f305cd8e120a0a7674ba762

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