Malicious PDF — malware analysis report

Static analysis result for SHA-256 573dd8c23ad95037…

MALICIOUS

PDF

81.8 KB Created: 2021-08-23 11:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cc4b94e5ee458480873c82e1791f9b8 SHA-1: 93dce49739dcb56db944ad8b8aabdcbf5f902e32 SHA-256: 573dd8c23ad950379e3fd67321c1c486aef2766cd6c45f97a046f65a91905c50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing attempt, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URIs point to external resources, likely used to host or deliver the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fwullong.com/upfiles/editor/files/68918159846.pdf In PDF document text
    • https://kimansion.com/uploads/file/11034096661.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/phbk5pcctlaftr05om0hr7stp0/lodalerefa.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/wawigagoza.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/t8p5p5n43jmq9euf2at0c6bi5l/49591988397.pdfIn PDF document text
    • http://alltechsro.cz/files/9959215005.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/zovagadoxawupopu.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/25775630290.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a7945de6ad007fb5adb625c8d5812dec/tupobubewafivamizixasoti.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a859b811d89---84716499507.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/98605459544.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160862053af2e3---83302949629.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/58847790181.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/94967f7432e2af1acabc35a6baac5d43/25647491829.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ad0a3a1e---jegusuzaxeviti.pdfPDF link annotation
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089501bceaaa---35212977240.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/22188370336.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2mt9ulu0otuj9222sf1hs6as63/63711581822.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/getemikaf.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160725fbc133c7---16058161840.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/32298433748.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/xegukop.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/88019778923.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/57441168541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=little+river+sc+to+conway+scPDF 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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10448 bytes
SHA-256: a7bf5c6effd513a89ac855531a0c173a1f28c97810c77c8f733b4e3aa9c649ac
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16632 bytes
SHA-256: b5dce00f909d17e4ba2b0dafff9600a9a4375170dcd579c4bda41ecc5d01b29e