Malicious PDF — malware analysis report

Static analysis result for SHA-256 76597b39466bad56…

MALICIOUS

PDF

98.8 KB Created: 2021-06-30 18:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a24e07314e133cd0124e81d37d490bb7 SHA-1: 6ffd052b4c503b123630e49a6b2440ccd3515e49 SHA-256: 76597b39466bad56ddc25b988a966974f7096e989bc09d0e96dd0421c14957bb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://chmelo.hu/sites/default/files/file/25285828989.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ap7si0ugge7kujj4op0gn0te9k/42768800113.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fd8031c4f---34214459111.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/mld5fn8ju4erdue8k6cl8ujfc4/ripobimifepuwamivuzusof.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/56106305898.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0020720001619806878.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2bf0beb9d2cf2e11e418aa4a34b65967/vokevitikuxavefetisetoje.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18024554928.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/96996051034.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9ff9718c35f879a08740f38a7a94c9e9/96439740259.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/95199142467.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cad62afe---kutugogedupisufoz.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/v9qi4kki9jsm3cejgs79gig2n1/79029584219.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/s970s7tb1l3ds911d8s0jrod22/nesovotu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a94c75a8740ac4cb9353db48c956f445/pojobozuzanizenomu.pdfIn PDF document text
    • https://area5srl.it/file/sakubibelagepuk.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/dixudowiwo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3b1e6e98ac6b3c6b86e31030487f4eba/57963042042.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/icds1nog60lifn2oavi5la4muo/90128826611.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3967543b97---dodikigamokuvowuwadax.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7a6e1ef9c---98212402582.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1b255ab200c59af98b8ea2799e035306/kejixaberunewaweru.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/72004de10bf87b95558d8e10624023fc/xiwofi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d399edcdd3---53510270208.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9ff286171125d68134b8d0ed8bef1ad6/jenesixupiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=top+20+great+grammar+for+great+writing+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 11152 bytes
SHA-256: b0f8a4091dd58104b490ce612241d41795dda20b19ccfac1b25860412cd956c8
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 20424 bytes
SHA-256: e73fe0e25a5b9adf5cbe18d02df837385796c725cdd004a16b7e201891fe3116
font_03_sfnt_off00013edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDF 27120 bytes
SHA-256: c771e9727b074f6a7e17b589df4788bf954e27f367b3407e627fc0df4ae26745