Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07b126de7ebd207…

MALICIOUS

PDF

84.3 KB Created: 2021-08-18 09:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37fee3c75aec2129824228fa8445e19e SHA-1: 0bc98720fc6c6d671d9b2945239922ebd71fd3d5 SHA-256: d07b126de7ebd207aec9f0c46d6492cc839aba39b041919513a0be9dcfa022a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=energy+transfer+in+the+atmosphere+worksheet+answer+key PDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5e3f4ea00e1926f469c379613dd8f958/dufob.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210606_071123.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/posepufejugaw.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/43643305476.pdfIn PDF document text
    • https://highrise.pl/file/44735985022.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd696b074c3---61277735361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109caea9d4d6---neviwamolavawilevine.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608107f32264a---wasudigufoxuzit.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/lojazubosara.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/47405637362.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/vemiwopameralin.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d3f6cb97---26521410366.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/20093740663.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/zerupopewi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11d019c7a---welukene.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e1eea537bee4fd706d55e042bf0d40ad/kagugasu.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qka6mis5g1l1nlic8j50ha2fd/bavoxo.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/10334372639.pdfIn PDF document text
    • http://citranco.com/users/files/60375360877.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b86aa4a6802---66616278531.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/dupikaxabobobafufovaki.pdfIn PDF document text
    • http://ge-mak.com/files/lotofarabobidigufuxaxe.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/30778920826.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/16340152775.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851a708ddc7---84551532562.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/lokudedumojimon.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ps1jbkj2nuaace0gukr641qmk4/tuwazobajidigu.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 11032 bytes
SHA-256: 947caacf77e525698507f14adab4cebc18fbe4f57d4a493a910fba0bc058a293
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16592 bytes
SHA-256: 3644bb05236bae1941e1098d0083424436bc00e0c052ac475cf82e5e41c1e51f
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1