Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb44cddb9e041e7…

MALICIOUS

PDF

114.6 KB Created: 2021-07-30 01:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b2510ad579ca6bedadc2959fa99f50f5 SHA-1: c7ed47f70719d3f2999293720b958e896a94d4ff SHA-256: adb44cddb9e041e7963323f31bbf79c058b9ca4ff9812015943e4a46c2b17f31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristics point towards a drive-by download or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/nuvupotawevuke.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8d99de52---bimomiramejozezeko.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4ef2f029c---25923024762.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe67f4a82a7---wesalaban.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/65204881333.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97c2555ae---vijirosuzanorobezuxeko.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6da8f7e9---denevujes.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b535c07057---tebif.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ea15b7e4---xesorepukajaz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a370ca1b2d9---25354398842.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c5b7e646b768b6990e1f8437e7396adc/65705671747.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93828571842.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/eb607249e4fe9d1cadbbd808cb846696/ragapidurixatuweju.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/52120165423.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/82556077602.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f8d724bbb39a9249ac28688f3c1b103e/vepipowujebi.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/namobigamavikefuxepexavi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/bkf9h0ih2215bo7nbl8vetueqk/sosutoniligobakopozuf.pdfIn PDF document text
    • http://mextro.de/upload/files/sikijikekoz.pdfIn PDF document text
    • http://midel.me/userfiles/file/50523406288.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/69726756235.pdfIn PDF document text
    • https://schmitz.cz/res/file/joviwagozusufikuxalule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+reset+my+cuisinart+bread+makerPDF 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_off000145d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEE 11008 bytes
SHA-256: 529fcc28605f648c98c9aa5dc0b51a622d7f171d3ed45aa080fb2f8c6bb4c72b
font_02_sfnt_off00017795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17795 17648 bytes
SHA-256: feb4719b686e79d1f3dec333fe41795cf04203353e753f0cb4a349e2a5818d5c
font_03_sfnt_off0001a5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5A9 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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