Malicious PDF — malware analysis report

Static analysis result for SHA-256 deea7ca56c035651…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 03:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18243628219d8ef44fa44a904fcf7639 SHA-1: 989eae781e6c46d21e19a55b139ebbfe89c21147 SHA-256: deea7ca56c035651b10547d4d32f38f94f56d002e49df7d731b4672b44fa2baa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic, to entice users into clicking embedded links. Several heuristics indicate this is a link farm hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.farmaciabergua.com/userfiles/files/29174578192.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/64604685096.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/rosuvemawolikenavat.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/60464840027.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714144389b---vebigufirovodokivuliluki.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c463ffdb3235677e176eefb76a6630a6/luradoreguxinokutu.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/wamaxutifomegunagizofem.pdfIn PDF document text
    • http://atomleasing.ru/media/File/60617447035.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/roximasizovovoweru.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/41562365859.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/jizanisevixivodef.pdfIn PDF document text
    • https://panama4d.com/contents/files/jidaxanunuxipebiwukipo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed91a9ce---65922848711.pdfIn PDF document text
    • http://airmon.hu/images/files/vumopoxogekovemote.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bobabamulutivi.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/zutigarotosaj.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/29482467107.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/suzapada.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/rojojakutabimag.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/96a051aec23a8c8c2b5828d393842d71/92027057957.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/33508328638.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/20583589533.pdfIn PDF document text
    • http://pneusmarene.it/images/file/lekitamoredefin.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/kezajonesinovok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=in+time+movie+freePDF 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_off0000af03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF03 10016 bytes
SHA-256: 33b58bc1f42a7062e476f8780ca3f4903b4f00b3abc55ece3bbfa3a9b7591cd9
font_01_sfnt_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 14064 bytes
SHA-256: 2858e5073efbd5f80d0874307ab47377f99ad6dacdefbfd8f9d2e2dbd9a5df66