Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5483201458beae4…

MALICIOUS

PDF

72.5 KB Created: 2021-10-09 08:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b854ccf14d5f1531af001f8f951c3ac7 SHA-1: 8b1f6e25a0e73f9c94b89dd63f84bea8f20e37e8 SHA-256: d5483201458beae47dd2b9bd32a4b2e993ab234e40e1e75c0751604984ae0924
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inkjetartandimage.com/Uploads/file/36440350179.pdf In PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/87244470231.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/13178296181.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/84685314400.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613842dbd8496---48728799068.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/48913053007.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/94266161132.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16160dfd853e17---19490603075.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/23575919479.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/13349757800.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631489743.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/33185973066.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/sitisula.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd70cb8ab---divuraridamowuk.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/55810610261.pdfIn PDF document text
    • http://kme-kme.cz/files/file/75844241389.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/nefababezoxukonaja.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/xaretegedopejetug.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/risarafakokinodajexixuk.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/88488416902.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/5209243237.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/40188130291.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/6028846119.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ccdf526e9544faf90bcac2bed4a54f8a/lalijiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=march+2019+calendar+with+holidaysPDF 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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 11120 bytes
SHA-256: f9d57251d85e6d9bd370bf38d63901c9a6f54ebee88bc232b2b9b0bd6c373779
font_01_sfnt_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 16356 bytes
SHA-256: c960e97ad33c8fd9fd8f50bed1b495a17878876faaee1b6084fa87b1dc05ae76
font_02_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1