Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f7875fef3819e2…

MALICIOUS

PDF

89.8 KB Created: 2021-09-19 06:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14257e0b20bd2629a36efae8b470ceac SHA-1: c668b74f4094b6603bbaf7d0b68802fda4b944c2 SHA-256: e2f7875fef3819e2f8574dc06a8f9fd66ef43869a110a160381884df73b28f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=programming+in+android+tutorial PDF link annotation
    • http://castrolmintabolt.hu/images/upload/file/55249569716.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/rutiritikijoxin.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jajazetekopuxod.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/15720259934.pdfIn PDF document text
    • http://vecsecity.info/editor_up/motaka.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/90339979664.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/27627083924.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/xinosafaga.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/46751515912.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f567ddc385---9839399977.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/tofunazigatiponewip.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/43064795629.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/zulekiriwo.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xujibel.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kewerovupivegopovowodaret.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vekagokivipozekutixiriv.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/noganadoza.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/87003143015.pdfIn PDF document text
    • http://vina2002.com/uploads/files/fanekusaxanajaragex.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dkchh4flnlr4h7t049oumn0vn8/33494660816.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/lowonepumonaxezaw.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/68860952698.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7db0ddd20d379ab2de395ea6471a8586/65406561243.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/fosozajad.pdfIn PDF document text
    • http://7profi.net/userfiles/file/zojigevigizivelipod.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_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10392 bytes
SHA-256: b42550c7583bee4d64b8760677ee7ce40dc5e09e927cef003a4133cbc8e3445d
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 18752 bytes
SHA-256: 1bc39cdc4b17c606c14550e3c7ff2acc7a2b5a2a63595ce3f63d42bab285b690
font_02_sfnt_off0001414b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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