Malicious PDF — malware analysis report

Static analysis result for SHA-256 3975e08c3181a727…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 23:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 404bc8cf0df131fbe948d96f1aebac19 SHA-1: 68f541a95a268e3bf8db57f398670a9992fb1d27 SHA-256: 3975e08c3181a727fa91ad4827c0c0fd697c98d441d6dab55dcedd6797cdbf43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure, likely attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=cleaning+and+sanitation+in+the+food+industry+pdf PDF link annotation
    • http://elencostruzioni.it/userfiles/files/45481257895.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a45ae4b9---45167329338.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105200554.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe001d7977---5741014135.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/feretodowapazijikopitofo.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/suzatiturolipajisuwaliwum.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/doxovofiw.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/taliposidiviwenatanol.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/susiturujo.pdfIn PDF document text
    • http://abworder.com/uploads/files/dojab.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/49637948930.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8771e5917fd40498e5d8e5d90db3fcc0/bibumu.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/mevotakebovawimikupavemaf.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/raxuxupelex.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cpc9c3bv6is5k43a1enobmp9e6/nenotitovajunetapiwo.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/92434198728.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608471859819f---zeguvegajubo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ec3c56ed---ledomupukejesagazuxupu.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/48449553598.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/29075025671.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/kufarurem.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/54367131737.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/87478896583.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/5912382670.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qi3m44dp3id0f87dn8dolfpiv2/87906823179.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/jajevazepiwujolez.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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 11020 bytes
SHA-256: 2cd5d29e1d9214c13dd852c37753ea8eb4788a61478625672471bae1c4cce5f8
font_01_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 16844 bytes
SHA-256: 1a8437ba4a62cc266ef25e2f4b424cd3f15dd4b7789553d8de045cfd6749cd02
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1