Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d054eaf063d2eb…

MALICIOUS

PDF

60.9 KB Created: 2021-09-21 19:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe50abbae79ad8c96a95c12ffd1d0003 SHA-1: 19aa0520346d9a451da86c1e21d334efac7a1f02 SHA-256: 93d054eaf063d2eb662b7b8296f8620e2cfa0dbc35bf2fd661d5cbce3c6d8094
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm pointing to potentially compromised websites and algorithmically generated URLs. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5765

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://archism.ru/uplcv?utm_term=what+is+your+browser+on+your+phone PDF link annotation
    • http://avvolodin.ru/upload/file/13770700444.pdfIn PDF document text
    • http://zuche0551.com/upload/file/69833661907.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/65019773470.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/putaro.pdfIn PDF document text
    • http://cosyromania.com/media/file/82170319937.pdfIn PDF document text
    • http://domosplast.hu/files/file/bapoduxavadekadezitewaj.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kitefoxuwuwiwololimadul.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/24767918884.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/34637980936.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/29197530812.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/bamerake.pdfIn PDF document text
    • https://btegypt.com/file/95315292465.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/tobigo.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/vibiba.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135bda23ec46---34848604498.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/81690573433.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210907200516.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2ac459b7---mowirolipevap.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/40503595274.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/zawakigaxajetuvulirun.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/52423089424.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/lurorajekimejimokojitorab.pdfIn PDF document text
    • https://projetovm.com/uploads/files/zelunajiwonazu.pdfIn PDF document text
    • http://moristas.com/userfiles/files/koluritip.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8066103f---42186812717.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/zamesupenekiruzisomizubef.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 16576 bytes
SHA-256: e7b85b7f944ee5b862e4ba4b464e10dccae0e1d6e4c096718feddda4f2a08dd2

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