Malicious PDF — malware analysis report

Static analysis result for SHA-256 07570842b2578adc…

MALICIOUS

PDF

93.4 KB Created: 2021-07-07 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1d051539fdb1a59f0e9156d7411f6e2 SHA-1: 0e93a542368f5f599b49ea312ce3b9ecf1a9ed9a SHA-256: 07570842b2578adc47b03950c25cf82783c8278882ffe20340bf2fe84e2feb62
172 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely serves as a phishing lure. The document contains numerous links to external PDFs hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of invoice and download button lures further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://de-ko-gmbh.com/ckfinder/userfiles/files/79326237117.pdf In PDF document text
    • http://dieta-plus.pl/userfiles/file/gikitekabamubilitumibu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/37283432070.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b7fbcd80---nuburowomibelasugulu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082912b1eea9---63440472478.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/gosogegewuxewex.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/48407939129.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fb570832b596b7294fac63f097ba6fec/gamokububokema.pdfIn PDF document text
    • http://canoeing.by/pics/files/49998830969.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v9ni0f6k7fmps829t84suj4reh/nesavo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56386c93d7---jefas.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/regalepiw.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a0d0b2d6c---rorodizerepivafo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8420c61ab5---vaxujiwopixemomixifu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aafcf4dd68---ziledepelejolawigedesabu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aacef8ec1e2---sobariwoxulo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60bfe54754---vodexaxofuxowaluji.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kudurumofe.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/33916104906.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c3090fbc---82880027175.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/povurarixena.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5de4e7e1---5757959838.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/liredaxuselivugawubufami.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/620ac833c50821399d2060ce35aa64e3/bupudiwib.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/1023788077.pdfIn PDF document text
    • http://dogable.de/userfiles/file/27908038826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+bookkeeping+and+accounting+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_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 17452 bytes
SHA-256: 00b27a28c33c813c97d6cfc31c5936694659f3d2196373619de366cb57dca012
font_01_sfnt_off0001380d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15024 10864 bytes
SHA-256: 63f70f87d9b6df27c683cff74151b9d7c96f41876f0212677dcb8c6c892f9a7f

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