Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f05ad44e9512486…

MALICIOUS

PDF

82.8 KB Created: 2021-07-27 12:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7e340b6d79cf6d3594b1ee8e79049f56 SHA-1: 75f46b8e1f5e07b61dac62e95991d0c3a073448a SHA-256: 9f05ad44e9512486aea87119ea650973bfb7ab3f6496e2829f9daf8e4c1aaa05
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://resurrection-life.net/userfiles/files/vikevenadurofewamaz.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/dbe4865019cb83ffce34087ceef285f3/39917925151.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/databux.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/vevosefowef.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b80d71088---pavarotata.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/lusidujoninopunotiwibad.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/95864380875.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/131405354223.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/59290293703.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/vugixojokes.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/idd6brne4q80apa8mj3l0ojtgt/64064296099.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa03efe6828c903e7ed43c68d4ed1b50/71413862366.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1bf15c30c94bcd28f6e70f4270df3784/kamakuri.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/sepororav.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f408e518---25583056706.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/20795008567.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/eac4540a92ad7285f0ae71747dde93d4/linavobakixafolu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fr2p1vvg7fj8meeceiu2vur3kn/minefivosewuxokuvuxipuron.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11a904bbd---94375728473.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797be2140d---vuwisopovamolodotefakow.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xawux.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/basebilurekumofe.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/625d30f7a2b0f41555ca1ddff934fb59/72166901978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=criminal+case+the+conspiracy+mod+apk+unlimited+money+cash+stars+hintPDF 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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 17472 bytes
SHA-256: d0ed819b131ddfca0ed3668ec4e6710f482506b9baa82a2adb9b092e1322ceb9
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 11116 bytes
SHA-256: d99a0c4633bc40955aa55d5dca50cfdbe1c3a7045fde99fcefd2283744586baf