Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b422b02d8a6642…

MALICIOUS

PDF

72.4 KB Created: 2021-08-20 17:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3164196e9a3f503c1bc89870860480cc SHA-1: 4debd28977a273e1c5dfc08055b864b3a05159f8 SHA-256: f4b422b02d8a66429aaf989448a3d32188bac89b041e1cc31af85a5886f12316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=what+does+the+dock+is+connected+mean+samsung+j3 PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a2d2cbe9313191db91fd6eaa5b121934/nipumademudalino.pdfIn PDF document text
    • http://emaaravm.net/upload/files/savozudasibemugadi.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/3028708513.pdfIn PDF document text
    • https://ocw.tw/uploads/files/bupepemotolexore.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3ec23eb98bc39075357c9ba8aaf5437e/10249863473.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/dabekikorejojoxisesoxof.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977d88bff16---5085680744.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2de25fe4afbd96f87f7bd37519f2a396/dosipofisapuwudox.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/73778651604.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/salonidofelujifa.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/75919715239.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/58967380234.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bojerarivatemigoderexodog.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/57068353384.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/borepegopazazitika.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/nakewudipetofoniv.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45499811f3---23670968590.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/kenubisokugewofufufapemod.pdfIn PDF document text
    • http://compsult.net/userfiles/file/87410751820.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ae1c1ed585b95c8916900f68b0f32433/takom.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/83366159205.pdfIn PDF document text
    • https://forums.androidcentral.com/showthread.php?t=880124&s=b41b478bc8c8fc069807954b21f53de0In 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
    • https://forums.androidcentral.com/showthread.php?t=880124&s=b41b478bc8c8fc069807954b21f53de0In 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_off0000b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 11156 bytes
SHA-256: de9fdf167391ffea440ef8ecfb2d06e8dc684c350ab74f6fa7087a208e1c7cd9
font_01_sfnt_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 15964 bytes
SHA-256: 769e699cab7a3ae012967826fb0cc84f7374a4ccfba16642a255e212322aff90