Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc58ab91b4a3e36…

MALICIOUS

PDF

137.4 KB Created: 2021-07-03 23:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c063415ea091b56dce4b30a05904c2d SHA-1: e3e20174a5ccd9f14f52789ea50dd555472668e3 SHA-256: 7fc58ab91b4a3e36f7c2821c002e3065784a5f6aa32c7de760c51e5a91840079
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of external URIs and link farm characteristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://smidgel.ru/uplcv?utm_term=manual+do+duster+2013 PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094574d50389---pixukefu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0b969ba4---favutipafapevunaw.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/85707253717.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sejapafugigifavenoji.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/30136237342.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e1e038d2846bbc28d082da427048f77c/55259807117.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/rapipadipagilemak.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fl5jubppnpn6ud61tgnbm60j0g/56013664418.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hd0o7h5pcqpq77lnjm8sbfdje4/31201029273.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/447e41774431286bc74bc3f8e1fbbd3d/sifezatanawakibosake.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/bmb5t51ne6hpral2jc237s9sb1/5740782009.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/45945115219.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ff5b10k5ohgujvlt1moujejbtb/24496761211.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m04989ihnce43luqbb4jcn9tt6/buxitizokisifuzis.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/rijelunizezoxixanidekogab.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/52816246436.pdfIn PDF document text
    • https://cecprint.com/images/file/xipemitutarexadob.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/tadelog.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/23065951590.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/25317317789.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0cb2ef07---vifodarusujikafubudomava.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/wabemosatuxuvajumu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4a60313537b0a872db60648716d5074c/vufuseko.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095177697ac5---kidofobunifadetora.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6ir4tk5s6o49k4hmqv15agcp8b/52117920745.pdfIn PDF document text
    • 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_off0001b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCBA 10708 bytes
SHA-256: 437478bac98a0d094b68fa6b5762dc40d8abdd7109c35b2b2cd0112fd4398ac8
font_02_sfnt_off0001e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E592 19576 bytes
SHA-256: b1db888b8b343d4be26dc76a139c266109aa02deb2356f49cadd1412663dd49c