Malicious PDF — malware analysis report

Static analysis result for SHA-256 c490ac71eec33746…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 16:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ce08a118313868ee76bb192299fe47f SHA-1: fbce9eb2f617b39de7712232544d35f2fac83c1c SHA-256: c490ac71eec337466b47bae0e3d70b532c266079999cc47737c9ddcf4520edcf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the PDF's structure suggest an attempt to disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://koncnc.com/genelresimler/file/xonik.pdf In PDF document text
    • http://goldway.jp/upload/board/file/fakeli.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e36533236cf---kegogosorivetefijaneve.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f042806a61---tafubopazodudi.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/89994250336.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7442fdbef4a42f71e85eb73460a19e15/kagusoziwuda.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/lp86e54i67r7clkihf70h6po7u/gebejesulafoxeduboze.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/34111205494.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/fazexelis.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/49818573735.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/3169046840.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///57295619618.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/29545143462.pdfIn PDF document text
    • https://360mart.net/uploads/files/mazisajepasipuloz.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zesoxigosejigovufukesosiz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d33c1aabc9edc39e37c4126b4deb834/bulemu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1dd954b7b4ba7515aa888ef27ca4593a/dosaxitavepemigapagipusa.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/93886445590.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/bufaje.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edfd4e3a490---rolawenalifakuva.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/44363482063.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/wogikadoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=picture+interest+career+survey+pdfPDF 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 18444 bytes
SHA-256: fc87b5e2579f3027f1e745362b81ac221af2bc85f1b0e3b152cbe397b21e40b4
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 10728 bytes
SHA-256: 77b3632ab01302d6980af8dc833dc3044141cbb0f3e540f857e9abe7bfd8d064

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