Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bb2bdd10841734…

MALICIOUS

PDF

109.5 KB Created: 2021-07-26 03:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6115e0f3791f7321af975a9c6305a415 SHA-1: c58ad5126ea7bf8275504a54b6392d798150c5d6 SHA-256: 64bb2bdd1084173470261f98216cacdff970b25615befa1381f44a7e7685fd1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, embedding many URLs that point to potentially compromised WordPress sites or IP addresses, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the prevalence of malicious links strongly supports the identified attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/1e26a871a721f6471f62c458747a7572/92941860956.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce74a51ad0---pigokerogotajelisu.pdf
    • http://dulichtantai.com/files/uploaded/files/74665800200.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606e280927e4d---jimefopekalagalewabotud.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1956e5d1fc---sanezikasunuvuwumas.pdf
    • https://africanresearchcenter.com/userfiles/file/43145659835.pdf
    • http://medicaldistri.com/ckfinder_files/files/tabemerotizivuwukotudik.pdf
    • http://applexin.com/ttpsea/files/file/famunujuxudizuve.pdf
    • http://hopkinshigh1988.com/clients/75739/File/39514319295.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/solenegekukasurib.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/04abcb547949b7126e76c295085e4f89/50679896240.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08a99c861---8055417830.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd51cc9265---71935590713.pdf
    • https://clumba-indoor.ru/files/files/gumekozibuketile.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bba6a6c29eb---17554810798.pdf
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/sogugofomaz.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b72553608---dorimunumifigenexug.pdf
    • http://tuzvedo.hu/elemek/file/90334371538.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7bee56e1---mazak.pdf
    • http://cafemsoffice.com/userfiles/files/80258793194.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6232aef6---34558531073.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/03a0hvqugbn8b8raef7403ha22/daleguzut.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff47e78f4---nusat.pdf
    • http://betonkeritesek.eu/Content/files/74752644584.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=when+is+the+new+game+of+thrones+book+coming+out
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 16792 bytes
font_01_sfnt_off00015ec6.bin
6333b777778f5e9ba875c1d1dbd7765da09870c2e397d33d7fb8266cf52e8bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC6 17916 bytes
font_02_sfnt_off00018dc6.bin
ebb2d2fd34064cc7b79a4fe7b9e20e4cb93fda47887b420e3b02e5cbbd62db9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DC6 11148 bytes