Malicious PDF — malware analysis report

Static analysis result for SHA-256 0391d2587b850e72…

MALICIOUS

PDF

121.2 KB Created: 2021-09-07 14:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b32882a8eb592ac9540d770971039da3 SHA-1: dbd89ad497d0c55f2b67347054667e532d92ef20 SHA-256: 0391d2587b850e72f4b1ee223f365cf45aa285668f65e587fdaf6739f99dcc3f
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of raw IP addresses in URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://alexlunacoach.com/img/editor/file/24425274998.pdf In PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/089826309843fcc884e8ed46eb429802/17392046323.pdfIn PDF document text
    • http://sun-eko.eu/files/file/lokowe.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0db47e7f4---gidukufa.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2ece460ab09a22f46fad4124ace3621b/36396681608.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/85c344d97bc8eb9a833888b8fa885001/roronitugugifufap.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9bbhpd60b9g0ldrc1hq5844oa5/58111875742.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a49f6330cee7fda9403f672c8de98e5f/mifosu.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/48499742693.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/bimomofepemajogofumupito.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/64651485860.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/tuwijoze.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9755e9247---36558697688.pdfPDF link annotation
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/60df42d4948829bba866939748cac27b/27428404027.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/19517399261.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d831f061b42---56269361034.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/galavolaxuwa.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94775adfb---48406756187.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/wadopejogawarexodufotexi.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/bojejemipuzifo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e52523ddcaa230b3c184b8b95fa540bc/49566261592.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/63567692922.pdfIn PDF document text
    • http://medrea.ru/upload/files/tonaso.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5b8387d191db7faaff920dc9cc85143e/35664636203.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079295d5de10---nazulunigajez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sad+but+true+tab+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bfe5bc5949ee175cc3954d0a63f37ae4/86588259196.pdfIn PDF document text
    • 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_off0001749c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749C 19596 bytes
SHA-256: 4279e85252b2d93ff7a22352b59fee434bb94a8e043763eab5ba4beb37b14313
font_01_sfnt_off0001a75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A75E 10276 bytes
SHA-256: 3d2cc24517b0c0183ce4669350672b0bea95c455719b3eda9ce87d1c5b137d55
font_02_sfnt_off0001be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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