Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5cfd2fcbacb6db…

MALICIOUS

PDF

99.3 KB Created: 2021-07-20 09:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffda1ac112b44e46c0342cca79da0338 SHA-1: 3d0860bfebe3c468dbffe369faeffc86b37d3a2f SHA-256: 5d5cfd2fcbacb6db6f6838ee61dac9efd3ab6b8905a939dbaaac4d08c7682542
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised WordPress upload storage or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bliznacite.com/files/tujigopumijanezewazazanim.pdf In PDF document text
    • https://digicpictures.com/downloads/gizusewis.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16075558d6c8a6---simezidevezoluxinajub.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1188c526c9---joxofapixewa.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/j6f6t5o6usi7493ep8sm6na9p2/53855642922.pdfIn PDF document text
    • http://yuli-china.ru/d/files/pitigexifebijifonusepe.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/1325894009.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/29428d8f98bd06e3e560329c78512588/11503079208.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/dakulutonujinofux.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1d122393---59697741377.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852983178be---maxet.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/iu1tr765sgigg133k692agk8ke/zofexolegalusunejared.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/denawukuzewu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/77030013020.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/27733016612.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vilaxame.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d8214e9e---53506892697.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacde448c8---67640742935.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rrmbd655kb2o84r16t29788n4d/winadibewuwukezojafosu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/fedogifopijorotelosuvu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/26402615083.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/15jggd3rpevdkt2riuutbp7eb4/zuselajilepobilunoz.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8b5de7dbe64c6668686b72ed4d68f9c5/56383050666.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/41853759715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nice+adjectives+that+start+with+oPDF 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_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 10576 bytes
SHA-256: da90bcf91c6ccffc44aa577b24e00b3b05aa26da33f771a882d6e53396ced56a
font_01_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 16596 bytes
SHA-256: e50efc2afaebfa6ef8e77243895ae12047c4d028a522ae394c5f10a665649171
font_02_sfnt_off000167ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1