Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d1763a3f19e83f…

MALICIOUS

PDF

91.9 KB Created: 2021-07-02 03:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db5612252f58f68191ea880f2f43cad2 SHA-1: 3aa0c7cb1e4c10ccb36b79011379cccc74cb5b14 SHA-256: 05d1763a3f19e83f1432f82a10d954737580a9bf2e958ac36852bf3fa5b96ca3
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c326be78ffd---91976597717.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e2404t3h0kgpkbip29vggk8qj5/81046099413.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fa5c5972---fogasazojudute.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620534599.pdfIn PDF document text
    • https://medtek.vn/storage/file/baraz.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qogjp8p83ibo7schsdquic49ol/tetapofodifim.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/40273917688.pdfIn PDF document text
    • http://aplus.to/userfiles/file/busoze.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/20713783423.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094b06e380f0---tasenigimimawivaxexuw.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3c890675---29086073468.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/21849565208.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb0609134---17493615747.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/zebubejomedoziramukoriso.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/27524548328.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e6b471da---kazuxopezadinej.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/64241928305.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/cd9698aa01677f35893e3a73ee9d1b6e/jowolikukabiju.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/majikoxujugafazav.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/37236845863.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/lowemasebugitulabi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/63f0cbea6ba0a644de7bf7fd4566c536/68216145622.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/88284321128.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/77800300034.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30757d3680---sezedafewazasox.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f87869ede4752a461d44ee1cbedddc7c/34671056564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cracking+your+church%27s+culture+codePDF 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_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 11020 bytes
SHA-256: c99c6487ead19a2b39bcb58ade3588d26ed10b4e0f52fda40b2a17827a10cace
font_02_sfnt_off000134a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A5 17820 bytes
SHA-256: 669f5d484ddf73704a1ebba1334f515ea7e5dd3eeacd4154f929ae32f049b6e1