Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6ad72afdc922e4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 20:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76d43a752461bef4f69d10d512832956 SHA-1: 8c0387f3b220c08070303cbd4f757e6788ccb8cd SHA-256: db6ad72afdc922e428eb368e3f78bfb227fdf21f0a560ce4ab92452bc6762987
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's purpose is to act as a link farm, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mcrlclient.com/ckfinder/userfiles/files/fewaku.pdf In PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/68968534301.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a6e238cc0b58b405310aae8d9d8410dc/fotewenupeniva.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/13898720772.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/99363927696.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/xurarinewef.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/69709762079.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wifasukod.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nejozavezibofaki.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/iluqoq9sdc2hetagrqukuphuct/nojijora.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/bizerojiwozin.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/degujunofabifos.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4257a5b79---zuwijugixifelurafapezasan.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c214cda53d2---tidolemuzugibiv.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/3515014654.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jijefogajulefupeji.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/demimosanasewawinitago.pdfIn PDF document text
    • https://eslms.com/userfiles/file/55050261439.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/2648694661.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/6652666402.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81f601bd3---65947291737.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885cbe7645e---rogumured.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=computer+motherboard+types+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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 17284 bytes
SHA-256: 8d89d2da04cf6ac6dc6fcf2ef5d4763311de04c393fff4f7c45c7c92cc2cc44f
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10904 bytes
SHA-256: abff3e3924a22dd571632d6977e3008ab79c5d8cf2dcce2a7efe7349c1a66a46

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