Malicious PDF — malware analysis report

Static analysis result for SHA-256 630a011ba88e1578…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 11:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2396858c97cd909c721b04425a0e87be SHA-1: e88ca9da24108693f454bec1041635285dbba2c5 SHA-256: 630a011ba88e15783effeec9f7b80dd05617c758d6e87eb5c2133dff522d77f0
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and trojan behavior. Heuristics indicate the document attempts to bypass security software and uses a callback lure, suggesting a social engineering attack. The presence of numerous links to potentially compromised WordPress upload directories further supports a malicious intent, likely to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fc8ccadc---tekoju.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/dekimidejugazodetabemo.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-10/20210510071812286719.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/2918501205.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/1734983893.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/rijizowatevulirefarunozal.pdfIn PDF document text
    • https://castel.ro/userfiles/file/60522605551.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/qc583lg90nubvgqjh1fbv2h3f4/gafugirubidudinakidu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608165fad7ee0---55584772491.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d4575660b4e13f38ceeec7bafd53e9ad/95933047679.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/ligudusidosaradi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/78433469070.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4b1af576---zopuzifotoxipomimatilori.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0fp8susaplhdfih75oj300882/11242538942.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nafimofupepopawukili.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/59906244803.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a462ede9a86---zasatadedokesirepu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qlmda1ro9mm1b36v4udi2as6gr/22320909065.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/befinefuvilizovojuvepiz.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/5524570143.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/20qio2sp5qf3raej5bql36tajd/tegoj.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd11c75e04---lipisojiw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b823976d6---62713641154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=infinity+dongle+managerPDF 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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 17924 bytes
SHA-256: ea01954c502eec62dd840fd525f18de3381cc4b6621677b433b80cdc5a48e701
font_01_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 10596 bytes
SHA-256: bc82cd0c6f9c408925b72d5cdca931ed644744d7498b47c9ad468946b23e278f
font_02_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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