Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde362beed2fe790…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 23:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebf918c2d7ee20f0c7b3d2aa03ef2e87 SHA-1: a4ef8d85c508e79471ae1f7be7ec1c859868e19c SHA-256: bde362beed2fe79076def4373e992960a4ad6bdb4656af9c1eb29d46456e04e8
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The document also contains numerous links to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to host or redirect to malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://angelofthewinds.org/ckfinder/userfiles/files/86039205448.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2cb477da---pisamil.pdfIn PDF document text
    • http://thaide.org/userfiles/file/79085579929.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/51463123222.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d6199d1f30c14335ec77230dffb74692/sotamariv.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/82040410045.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pibuxisidakejoruwazizeg.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/zadunurefubofaxegaki.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/34134843253.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109080630227663.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303bff78f06---zamatemupamepuxigosabo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5468c626f---8007213092.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/36070752339.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/wokegube.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/lulusafiregadu.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021941331453585.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/rilikikole.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/rebafazobumulivesalul.pdfIn PDF document text
    • https://cakkue.com/contents/files/34834585800.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210906_8E9BB66621953F14.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/timaxis.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/40579997554.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/32342191409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=phone+low+memoryPDF 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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 17168 bytes
SHA-256: 9b0ff3d1356da8b1abec044101b7701a75b7e78cec5c8e7b2109cb76a84ddac5
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10056 bytes
SHA-256: a8396acefd098fbea1ab61146ddf60b90e2d09c486a24428d7dd6a0a27e82d86

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