Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55726eded6236dd…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 10:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54b2cea9b19f148a7fa6fb87bfa7c765 SHA-1: 29c8a637d67cef872b1a762980e64659b8422153 SHA-256: e55726eded6236dd14c4c1afbf98028ceb78ea969377197ef3778478da693e74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristic firings suggest the primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://residenceraffaellotorino.com/userfiles/files/nixejurewugarire.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8kvmka7iusmnj4g7ehqgq67o3/dadaj.pdf
    • https://perfecthospitals.org/FCKeditor/file/54595075262.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65bb85a6ed---37697176590.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2tdd206su9q31m9foo6o2v0v34/jafixelakisil.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/488ffb930bc0921d0eb2912740551f7d/2931730140.pdf
    • https://marosme.ro/hirek/file/70579605031.pdf
    • https://yocarbroker.com/upload/ckfinder/files/kurafodurim.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f5f08fd3306f162bb55935b8322590ac/62228997633.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/hcpru84r838s8c4kmqtjoangt4/rovomanexosupudebafagoret.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cgev465l4kfimt5f82s7uumg97/82468824000.pdf
    • http://matstravel.ru/userfiles/file/gopomorapifurezazafegofop.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/62ab8f83875e351845281f686b3da7e2/22567856914.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/i1a379it96mug4kmhigp30hje8/7741261019.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66111b0906---89696956213.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/imrbb9miihm993qra93odnd3u9/wufamupadaru.pdf
    • http://nutranghongngoc.com/media/ftp/file/bizilodajodewarofumexirok.pdf
    • https://burstallconrad.com/editor_files/file/22905182850.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/s6tc7jf26l8188s6kh0bkf1us6/dolirogo.pdf
    • https://perfecthospital.org/FCKeditor/file/fitiluduwabaxunazu.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c34bf0c8916---71136210840.pdf
    • https://egca.fr/userfiles/file/34934027485.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1be3b312a---75067423975.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/g10q0bpsgckrjgdqh0squ8j9re/zezoxuxopobofotilekiw.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a4a1d4f2---33261225745.pdf
    • https://dbjadow.pl/attachments/file/xaligeturesalas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=great+small+colleges
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac8.bin
7567fe7dcd30aa7c1d74db9578c02b40291af531911879427993504d3cbf1adc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 15972 bytes
font_01_sfnt_off000103cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 16792 bytes
font_02_sfnt_off00011be4.bin
12a3bc4018bff018d391dab35b1b9f0a260ebb6992fed84a3c2a36292e571685
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 10416 bytes