Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3efd2fbf31fee5…

MALICIOUS

PDF

89.8 KB Created: 2021-09-03 17:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 151ab3b78d9aae1ee82897bf3ca45661 SHA-1: 8149b3d567a3f3e39ce42b1ae457f6d736cd595c SHA-256: ab3efd2fbf31fee56021fc1d1becf436f3f26c7b6436eb4d73c9c9f7348bd18f
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with tech support scams or fraudulent billing schemes. Multiple URLs point to compromised CMS uploads and link farms, suggesting an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8dd120559619c9520190fee20fd8d010/22679519378.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/91cf522de993b8320312eb7b0a24a68b/vemevikejuvazufoxujevozij.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/lizapimukamefobutapate.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/74413467220.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/puvexugiwulanojebit.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c69444656d2ccf9e62e5b25f09ce054/sisawewivegusireminiguso.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/60435570147.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/lulurerikis.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/73847c9f9c50df6e17f9fa8dc97b938b/49878860819.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/kafujama.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6fd200ddc4bc756767e4055d111bdefb/10246376986.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609878ce50bc2---lizusozaselus.pdfIn PDF document text
    • https://penal-garazh.ru/files/73561886827.pdfIn PDF document text
    • http://jaika.in/images/documents/files/xenezibiwaxeradef.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/23035983953.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/misobiti.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/gagomijabotub.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/31339704690.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/38803069179.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21afe7dca6---37353727918.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce59dc7055---14771328644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=polite+request+worksheets+eslPDF 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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10364 bytes
SHA-256: 96c0df2835cc74d082130a94536a8ab3f8329fc7250f602a31418c6ead11486b
font_01_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 18704 bytes
SHA-256: a78931ee889a39c30dd20781db94744b09b5ef948221db1083e8f721b712845e
font_02_sfnt_off00014006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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