Malicious PDF — malware analysis report

Static analysis result for SHA-256 591576b0f7c2928a…

MALICIOUS

PDF

95.6 KB Created: 2021-06-27 06:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 75755a116520e9403fa463d01a5a8dfe SHA-1: 35bebed81f46d0361c84a4258324ae925d9181e8 SHA-256: 591576b0f7c2928a80d2d455508bdb07bac443f1b764e6d193e46561ed1c53cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://vishalahospitality.com/ckfinder/userfiles/files/bipigesov.pdf In PDF document text
    • https://nevisnews.com/userfiles/65521287089.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ea9160cad2e3957d4af36159b7c1c4f3/xunurazafilonepuranesi.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/60405202621.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f5bf7fb10d1203ab9002a3d06339a3e9/bogufu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090b33988c68---nupowinekid.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0a394f1ba31360a71126630bd74a209b/jogojefako.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a35173144d2---xadabupoxasorixexesud.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877fbf0f72c---91971249412.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/33626391822.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tejuxubivatuxi.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/6421407054.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/30280037791.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b607aacb460---48897711429.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/n87phlfsgas8kvm06lo5v67u75/29105066750.pdfIn PDF document text
    • http://susutour.com/userfile/file/47231495451.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/23931040682.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/l4vb51i21s16md8g7aeju60u3g/1853862584.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/51c519404f502d26abf27c7ca286a1a6/bazimorefesonefibun.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607259e7b200d---80031692762.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/uaqe3mdhf3pd9l9guue7qeqdpr/xefutag.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/zuwamana.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/42302741861.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f250d08455---20893301991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+electric+resistance+elixir+breath+of+the+wildPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddca353920---roboruwotisivexovisofowu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 11152 bytes
SHA-256: a6d1bae6fa995cca7ef5b9009b8b79addae9f07b9fb67f304f6bb761de8ec8b8
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 18088 bytes
SHA-256: 5cc9e868b00c1f7c594d1c4c0f59861a8b71bbe882c083ee14436c16b1325368
font_03_sfnt_off00015792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1