Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41117880afae7bc…

MALICIOUS

PDF

94.9 KB Created: 2021-08-14 05:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b54281f7a80e1c7db8deaffa5011691b SHA-1: 2537b569d6373d74a1b5f00dc75071c697769032 SHA-256: c41117880afae7bcae589afa8572ebc68e95702bcb2a1ea8e66171ac2c139e55
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it functions as a link farm to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://doctorchina168.com/upload/files/93916715710.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f76433578---xonatu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160898ba637c17---fisum.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/kebigoxerololala.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5f6df210761c8bc82da49fa82eeb6902/dagives.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b15a6ec68---zexazogibi.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/netelubogez.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/lixijulafagidojaxujaronex.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/5ebe743faae86c0b6227938df885eebc/43936123401.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/92101704438.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/23554127090.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608265fa489f8---83551859428.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/fanemikufelopogaz.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff047e5b84c---89175156252.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ce57c4b702e2343ec04f96cc69cd981a/66674429325.pdfIn PDF document text
    • https://petikdaun.com/contents//files/kujakog.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b2feadaeb41654a98e755a1e9fabece4/juramaxinezabemevita.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/jesawivo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/01028f8c16155500365dcb75519e8590/7058226608.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aa00aeda7---43593671701.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608172dbbe5b6---40901287411.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nirexo.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/46443252628.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/morilebuwubimupoguzo.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/ropir.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/pavasupodevuxapitanovu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5omghj341eeisf4k2pqflun141/duvowimoliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+guns%27n%27glory+zombie+mod+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 19012 bytes
SHA-256: 780a107b28346a1a06dd42e77b9f8dc52dddf64fcbb1388baaf97e1acbb74f2c
font_01_sfnt_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off0001471f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471F 2456 bytes
SHA-256: 51a5986d33f5b7b66364567419300c279aeb3ff0fe636b4bf170cf2f1806e7ff
font_04_sfnt_off000151c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C8 11264 bytes
SHA-256: deb22e268b37e2dfa453de2e9b2b90463a63a58048af538ddbe03ec76718e949

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