Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc61e41fcf109af…

MALICIOUS

PDF

82.1 KB Created: 2021-09-24 06:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cadb8f98a95900152537aa2d314b5f6f SHA-1: 519dd6dddb3a3563886b077f2ec3e7b2d8e81a70 SHA-256: fdc61e41fcf109af2c62560640c87bda275f4335877d3f10d7bc32aab90ed9bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, 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. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to phishing sites or download further malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hide-bo.com/img/tmp/file/tuvuwuxibimena.pdf In PDF document text
    • http://le-nora.com/userfiles/file/78166664264.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/81166500675.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-18/20210918004823916886.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/bewolijit.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/66e44dc6dd6ae6fd3be31f2ab693347e/23565992065.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/ximobutowulizivudup.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/49279758489.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/088b8ed91c901377d6627eebcb0c7203/36635914732.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/55635736189.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/25631336602.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/nimoranenamipi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f39b0c3f2ef7824fa287f13a0338121a/33821921526.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/gubexemiwikajitosu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a5do3719kg61u985tbei8r67ta/68414563244.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/javopodukanemerajopukud.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/77491738889.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pubixotapofatazije.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/rilakudarexozodedes.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/43cc17df7763c15878d7fc3f312dc56c/wogirufugumepijasuwabotow.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ab45d5807804a2da36e3b9c775d97be0/nuwuzazufe.pdfIn PDF document text
    • https://oferta.lt/i/File/bumekezozamesam.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/11323716599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=apk+pdf+proPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 18136 bytes
SHA-256: aa48f1eda353e46ae92ee681356a7c7347ad80ff68127920215f0ea192f6988b
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 9760 bytes
SHA-256: 20ec901b7f2b6e9973cd3812f472d39ce9f46aab124df9a22fdaf3a823638d32
font_02_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1