Malicious PDF — malware analysis report

Static analysis result for SHA-256 2613712bd7e3d677…

MALICIOUS

PDF

151.1 KB Created: 2021-07-28 00:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c04a6f6891672a432ad847368399c032 SHA-1: 804419dd905081d7b795c8f31b28810c559ece53 SHA-256: 2613712bd7e3d6779012e8df4bfb4a6a85f810d87492f48f5442a9719c7df4d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO poisoning. No scripts were extracted, but the structure and URL patterns suggest the document's primary purpose is to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://laetitiabernard.fr/images/file/mabobikuzolanuwedo.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4a37531a---60128905633.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7c85ab57---pexutufanitoriremizare.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jlrk736ggp6747p170jp7vvav7/92206975385.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/32335790865.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608028e71c267---bobuvekabibogosezuxe.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/41268290340.pdfIn PDF document text
    • https://banghenails.com/upload/file/wurebilo.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vewunamaxadalo.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/71887902140.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccac064f7---tufafalese.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/bcf74c8ee2950f231e9ce37168b26dad/lalidotuledituligutere.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0beede7793c185c9481a1cedee7eb92a/nituwil.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/88758103439.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rm5v3ka4quh9m3dm84sjvfvkoc/61213796683.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/mizusonakubaxasipewa.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/vukubikemiti.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/safenegeziso.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/75044051308.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d6803882---60071504566.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a6def4f5---95428665415.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/zevotelenarubow.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/38549001832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=biochemistry+5th+editionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7E7 16516 bytes
SHA-256: f626fb5d85ba2453438dbf692e5f921450c259e0ef65f7392205173800703f9e
font_01_sfnt_off0001eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEC0 10728 bytes
SHA-256: 13556410e56edce4eaf86cb70247246c562f6b075ebcee27035e3ea6d2a0e108
font_02_sfnt_off0002074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2074B 17624 bytes
SHA-256: d33e1679bb43339b8dd6e9e7689085a62e5fc3326422099e46b2d818314908ef
font_03_sfnt_off000235c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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