Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcc5d80334f98ff…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 02:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b8735b28e132204494e53e44f7f68478 SHA-1: 8cf755956f9033b4baa076e49f8425c0688ae873 SHA-256: dfcc5d80334f98ff1aa6d9521b3d54d558c4298199c2730f45a26ed335859c34
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://chcial.ru/uplcv?utm_term=watch+mugen+train+full PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d7c09087b---munuwevapekuji.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/27287627532.pdfIn PDF document text
    • https://kueapem.com/contents/files/18837015890.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/81511464205.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/sofunekotojesore.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/bapekifusejilexuwave.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i5drvqv7bei18t2rjgijausnl4/44860223679.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/44924846566.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/16932840900.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910545534688.pdfIn PDF document text
    • http://lscapital.it/images/file/nakixunolufiwogusitigabog.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d8e6c6ee7f0783290bbb0ea6b21b5c38/19210727524.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/depamexuvotenesojorab.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/sidozizawofawu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/91128605858.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/35169530250.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/nubulofudaxuxudamitexoxip.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/53935638259.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/bejugidiwivexojuwamuv.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/jezojetan.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/gisanu.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/muxokapapidoxit.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/3817319764.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jodobazometadizonulujeg.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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 22344 bytes
SHA-256: f10bad3efe2dc56aef5a7a7200a0582a9d74d5bffb8ffdcd914e6a95d96c51a4
font_01_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 10588 bytes
SHA-256: 90afb22317e390c35449a857fd14545c5e0560cbe0972da2a0e3052b38a082d1

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