Malicious PDF — malware analysis report

Static analysis result for SHA-256 338fd7da39d8c068…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 01:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9271cb8332592a6aa7d2928a047fa746 SHA-1: ba1bbdb40efa102ffa5e17fb43dbd8a6fffadc50 SHA-256: 338fd7da39d8c068d89b42c93754965577e189fc9af5fa19847493dae4c44d1b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of multiple distinct hosts and a high number of links suggests an attempt to distribute malicious content or phish users through these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fef4d17c9---ruromibipepu.pdf In PDF document text
    • http://peak-experience-japan.com/pusozuketusuwimoterej.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wilajefijipopep.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a494cddc803---vibasesajotutuvizuw.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bea3197cf99811aa1cc95555499ffbdc/sevaluvirumewifubodo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e01b42269ad3d91759e6c406db3423df/20338946249.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab609360a---pukevevisuwetepiwi.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/10824756317.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b165c0da0db---jamofugojuvowosalujaz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d9b5c7cd15d307d627d85a1b45855d0c/4212955627.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d0622acfe301cfb5211ba782e295ea30/ligeke.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/17d024edce889ff0469b3977bc3bec16/52667269125.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ee0239a4---33991762382.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/trrfu443i0oop9pf6kh6t13dk2/labekulogufeniwozadoj.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0fafa656f8f350b197e163f99faf3829/92266728663.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/71183adff991c558c7e338794735ca24/95272020528.pdfIn PDF document text
    • https://stopserv.ru/files/file/vorazixubejowum.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/bajowasi.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/210a3a3044aac285a9f4a46263ca84d5/69010006841.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/81284338745.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac3680123---vaditex.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/02f9245c20318699e1bfad66b611d820/66118798172.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/314ddfb25b609f2c68d4c033a9bfaa44/todusodigojig.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a045a3cf9c0f81f1d4412aa8289de544/xariwafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=science+order+and+design+activity+book+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 11072 bytes
SHA-256: 39e587a3527603e1a0d263a0f695793722f38c9833b160cbd737d50311232eb1
font_01_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16920 bytes
SHA-256: e1fc5d15829e290da3101f335dc68239d2a6ed8eaa1663bcdf9cbf8fa6b49c0b
font_02_sfnt_off00014a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001627a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627A 2156 bytes
SHA-256: b6bdb761ac256384ae39193916f73726462b4bf4fadebc21a1e99cae0c55fd3c

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