Malicious PDF — malware analysis report

Static analysis result for SHA-256 8315748ed09ed962…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 17:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f64f7cc80c062d2eeec01901133bbb9 SHA-1: b9e2d320d4d4032563f1ecfc0d3d5954e1c9f149 SHA-256: 8315748ed09ed9627f43398a6cfb4a7d869b86ea355200048d6fea94b383f6e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://sonerofset.com/userfiles/file/700540208.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fb961ea1c25b4caf03d910744aa41ded/wowibuzugegaromugevepe.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/xokozukoxuroluf.pdfIn PDF document text
    • https://ibericadearmerias.com/file/98367483637.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/3342475810.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/6066161386.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/87735489325.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109121016147290.pdfIn PDF document text
    • https://majubesar.net/contents/files/zomesavasaketejukasafip.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/16789966995.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/fakerejaranowituguxeligo.pdfIn PDF document text
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/goworapasajokor.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/dibexikeribimesunuw.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090213573070554.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/34724407017.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/99791744315.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/xasoxoxadubo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8ec6817870c291d1c5ae4b4a99eb802d/mumuxeneril.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142b356eabf7---92550615661.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/5200949580.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/ravosunut.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/wunumifes.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgsu0lbu3vs31h0hnrto0p1rv0/lovevazidozixaduwig.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c78076b5f0---memupomedewirugisapaku.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090714490735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=send+video+from+android+to+pcPDF 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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 16840 bytes
SHA-256: 37ec96cf8514a71411fbe4e7a72c7bb3296804d32cc6d9c7476005cf22a7ade3
font_01_sfnt_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 10708 bytes
SHA-256: 2023aa3eab5c153160f38d3e2c1c8b8ea89ff013f2cbf4a48e7780ab53c2460b
font_02_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1