Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b161c101e4ef4b…

MALICIOUS

PDF

96.0 KB Created: 2021-07-05 17:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 722a6b6042a623e474b91384e6afd36a SHA-1: bcd7ce13c6de22cb1020e32ac8985fd13a494a3d SHA-256: 25b161c101e4ef4b15d6d8aabb5cdc6110aaef558ce9c324b45951cb82eab4d7
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 compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://chinajessie.com/seadata/data/uploads/img/file/162521560164.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/97125711343.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/jekesedetudoserinixu.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/venugufa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091efb0b5fe2---52988337201.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acce2b3bfd---tubokafojunixemigalag.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/nagedaxosugasoraretu.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wozobezu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/10487000556.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xotol.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06ca69bc5---58705265502.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bae1ae285735834f3214d3b7d02d880d/rabotubufizukeriperedidi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0c1551665510d1ddca5c302e171d5876/43038332551.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/viwuteruwafinipana.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/87613193568.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390e7b191d---pokatewelidajujifivaf.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/87102888130.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/op7dhum4bm2ukuth39avkrso25/96465551018.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5686003af4a892ea92e3a5be3d6b1fc2/59738366423.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/027b83631bc28d683f8842508d995242/57612442192.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/jegikoladibolefamizodunum.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d18d15ace65dab18ab03273ebb54fb5f/konozojemukulobixafaxul.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/sngh31k125b1lf0hdafrf7s635/tedoterakasezija.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc325b45cff---35040849008.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0ac3433fce07dbbfeb010cf800a95dc/vojufukigutosilesorekuvaj.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/36288751525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=puffin+browser+pc+full+versionPDF 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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 17868 bytes
SHA-256: 2ce1decbf3e20e9c1c39415fc9666bb837b65397306b0ea4d162a48e9896a125
font_01_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 10604 bytes
SHA-256: 26105bfbe92b01b7e4fe46dabfb2025d3e762960c38cc9049f6bd8d39f840bcf
font_02_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000151a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A0 1988 bytes
SHA-256: ae944d765dd940c7eec82d3eea7b32ade64d5b7de38a5fc6828d310934458a03
font_04_sfnt_off00015ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB1 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8

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