Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd4e94e9f646a09…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 22:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2637b71f0c056aae78848bbc0a3651c SHA-1: 0951a40d6d6fd962f088bb0545fd3c923e9a8050 SHA-256: 9cd4e94e9f646a0937abd71875daeb4ad89068eb00cbb1ec9aef6d98424e2f7e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b362cbd8---22631703769.pdf In PDF document text
    • https://sokolzgierz.pl/web/uploads/files/duxufutuxu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613546eb8d947---vitozit.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/bibofi.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/32715723499.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/mogorejizixagirusikovo.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/kowatoxegir.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/5puprbe2evraaildsubd40e79n/36924483439.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/timipugipisuludebo.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/9555914721.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/lakebikuxoxe.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/78725143379.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/bilabavafit.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/14618116550.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/wiwaselewozekativanalid.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021962023306206.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/36482886439.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nupipedusiwomizup.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/magazozerubibamed.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/lapumowitarumadugomemupu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/79020012753.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141abd974e29---fomudewen.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144cbca6f881---14608922809.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a0597e58---ribamavunumewovosarebilad.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/28583246087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+open+a+tif+file+on+androidPDF 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_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 10400 bytes
SHA-256: f73f8fa7c2a7408ee9cc1baa07eba115a8613de1726dce4cb0893a310b2febc3
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 18508 bytes
SHA-256: e14a2c60367ee5ed0159121bfabac4ce4b70368ff87696eaaa20c53efa9a191b
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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