Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ffa8779484e3b0…

MALICIOUS

PDF

91.8 KB Created: 2021-07-13 19:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bec10305e849db3e3eb3ce464525ceab SHA-1: dc6918e0b7a1510d16c700fc58449bb9f4bcebef SHA-256: 58ffa8779484e3b09cfc5a365eac04b21c1b9bf2d9d96476417c70bec9c01de4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to websites hosted on compromised WordPress installations. These links are likely intended to lure users into phishing scams or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5e8603b84c9bf3bcf379a2518a83e5b5/23396966828.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8djc8d1lpuimalja2mj3kb88pb/81342487763.pdfIn PDF document text
    • https://bor-diing.com/upload/files/72899156493.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ef5d152c---fivogosina.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mulevo.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/gelatagisilixapasufuvugub.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a4f8c9799ac373d07a81be30a2975e56/77068262329.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c138deb5ca4---tugukoxuruwaxuxapebap.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/03c456b0ce76f9fb97fa2567de162c30/20482245484.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1bed2ad494b386473276aa47bd48ee11/84852920532.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda84e61ae---suwetufofagajopadirato.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0ffad2255a710c5a3796e2780b75425e/bizewokanabobudipuguzub.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2c63387e---66871100279.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3ba46c3dffecc30baed03cbab9de47a6/goniwevafeduvexogijuzoz.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/74510983278.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5lkajvl9tf6a6nm9iijk8ss3cb/64476839358.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/3546675585.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/aff7ee2a2713a7159bf3568dc7d4e75e/vixunukufakovapuko.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c724564de---42126914918.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/97467770470.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/23f75e36aec69bcfd69e49c7ced8cc60/sizuzupadapul.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d9c1c2ab4---32315565563.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h3fobv3oscjathsc3l38kh554d/66938514518.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/samavomed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=is+it+possible+to+combine+pdfsPDF 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_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 17396 bytes
SHA-256: ac262832d6e57088cdc2ac998aed1136103698c3240413ae75481acb5a211ccd
font_02_sfnt_off00014a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1E 10612 bytes
SHA-256: 1709730c546486e4fed45c7ad095b2689ec5473bdae88a24175a73d7c2fff3cf