Malicious PDF — malware analysis report

Static analysis result for SHA-256 290d3f81581f80f7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 19:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ee72b7643ef4f503b610c8de1ebd5c7 SHA-1: da1cd543dad0734883e3be097f894aa061020292 SHA-256: 290d3f81581f80f72c552d2f4cf9be0476b7556bab8f7f7654693213c7c88d7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating it likely contains a malicious payload. The document exhibits characteristics of a phishing lure, specifically an invoice or payment scam, as suggested by the 'SE_INVOICE_LURE' heuristic. While no scripts were explicitly extracted, the presence of numerous external URLs, some hosted on compromised CMS upload directories and others on disposable domains, suggests a mechanism for delivering a secondary payload. The primary attack vector is likely spearphishing attachment, with the embedded URLs serving as potential download locations for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://quangcaosms.org/media/ftp/file/rukebejiditatilibusedeku.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/amst98e12dmdp6qknet2ja2ce2/lepugegibafo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e645f81d5b28f09d6533a831c3ab73a3/16812928254.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/torawobemusigilemudoxo.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210810_D095FF24810DC92F.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/49028928640.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ead54224---91522448817.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/40974485002.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/l69qsc6k2gctluenacvi2hgb4o/xirovodufajoweralu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/92029234324.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wegotejuxezaworapodaluji.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/gisawilu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8plek8dbnriuhf6mma5ase13r8/68447965693.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073bfcc9b8d6---22703980097.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd57292b47---xokesef.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/69418019332.pdfIn PDF document text
    • http://lucann.com/Upload/file/66133413807.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9kgiv4ab3svjff4d7dun2kflcq/52848686143.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5cd74e466db484ac861d92bbd3eae3cb/narazesapiwiwu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ap2h6sg92k49f0m2gggvpi67m6/rarelinuno.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc74f30dec---luvuxajiwin.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xegezimezadeka.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/17842802966.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/mobizebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=conway+bill+of+lading+form+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 17768 bytes
SHA-256: 90bf5c72443d1215d2f77e0dfc58eaf36ceaed29abbcffd358b6d2b57f46cc42
font_02_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 10812 bytes
SHA-256: d64b8a3d0add4bd44e896aeab30874ff50b0cc5fb1fd492e15a581b3c9dc0f24

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