Malicious PDF — malware analysis report

Static analysis result for SHA-256 c755d9cd02d456bd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 19:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c8d87b79600215695b80615d2bd8dcb SHA-1: a528f6dfdc79114ccbd456cfde35c3dfd1236422 SHA-256: c755d9cd02d456bddc1a317f11ae10c69c42bf60a1fc0b9a75b8a0dadddae1aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', confirm this behavior and suggest the links may lead to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=dls+19+hack+version PDF link annotation
    • http://tahyuh.com/uploads/files/202109110925335979.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/mexerulexowitumedadoguxud.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/xirutexigej.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fepuxagozatazobuzugowulux.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/dugejuluriwalagunekunuzuj.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398678eb1df---kapaguluveminelebe.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/xunivawegumedobot.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/tudilewi.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/31019596991.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/fewelipozifepawovef.pdfIn PDF document text
    • http://egitara.com/upfiles/files/50624327839.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/mazofovomaka.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/63211778215.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/231c4f52088667d2547ac6b46f6c4213/27402240468.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01da53d9e---36737622487.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/pulas.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tokolisebiriwesekoropamof.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/15153579526.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/wuguvevunifogorepegapu.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/zalepawolamufupe.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161396bc3a895c---53906129352.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/56330589799.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210911112328.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/74762441350.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_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 10608 bytes
SHA-256: b5f45891ae587006101b866eaba1fa0ff81d1d09c43a9c4476f68158ef76cccd
font_02_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 17344 bytes
SHA-256: 9d4dceacf4df41a297d3ce5ddb8cb6f9a99a1b115b79ef3a73ef12fc660adb45

Open this report in the interactive analyzer, or submit your own file for analysis.