Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d044b9d3710be80…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 15:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2fec31d2c25fb63b98b5fbe352dc1619 SHA-1: a1081b62d48090752ba885ab8d5931059b4e026b SHA-256: 7d044b9d3710be8074dfd4efd78fd341d2e9dbe01329c01813cacfe0d3559855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. These links are likely intended to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=landscape+android+studio PDF link annotation
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/78912991537.pdfIn PDF document text
    • http://teifsepahan.com/files/file/xenadixibibonaminogoxi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xuwutasubut.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/90721725287.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/gujuzekibubimup.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/42520711853.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/pevowuboxomapulabexozata.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136033b11e79---xilozobev.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/menegifemusekare.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/33966968363.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/pomizetam.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/dufatiwoxowadetulimiv.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/92983987988.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/sovon.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/libobaxawawevusilisoge.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/31654387657.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/55728294900.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sotigupududenuzufazopilel.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/1788446329.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161396abe26861---64242442999.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/85920487532.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/91989199437.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/68527962194.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/cf127e4ab6870d8d036b90b1ab16f6ee/legasibekiguxexaxu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/dufedaxenifizowe.pdfIn PDF document text
    • 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_off0000b531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB531 15828 bytes
SHA-256: 88f5709e548be410a27145d665f2ceae82e3c5f5c13caaf997afe0eee76c6f8a
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 10516 bytes
SHA-256: 732d00bf0011066648052427c747e1b49d5c0de5aaec22f3761e0ad002e6d945
font_02_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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