Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fac7fee6a31145b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 22:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae23923f80ca7e050c4d1020c91c58ce SHA-1: 6b2a0c08696d974902a9d644c7049735a37cacc8 SHA-256: 0fac7fee6a31145b6f485d030d64067ae162d35edfe0e85446ba8c97703b5e37
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fn0hfv6rcv89ejt6ehk3sr44m5/8953279476.pdf In PDF document text
    • http://denki-shonan.com/uploadsfile/numobanitotidenolad.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/lopulawogufarukeximix.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/tugij.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qol88hb9cmd9ga63vh7lthlrbr/6075188814.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a968f51a3c---xuvafafel.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/39060020302.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/napedaraduze.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/29561760091.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/84303767779.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/28879431569.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/rodak.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccd678889e---nixegujo.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/logisukoxejo.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/88077198032.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/godejinesosilugafopav.pdfIn PDF document text
    • http://rentaruedas.com/files/others/79651816648.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/13812250557.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tanakolanuzibi.pdfIn PDF document text
    • http://nemochem.cn/upload/files/naxodepopapopi.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zuvutinomi.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/xuwej.pdfIn PDF document text
    • https://nationalcardsolutiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=instagram+how+to+see+who+visited+your+profilePDF 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_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 18400 bytes
SHA-256: d947e1fb826d8499ea79053f805bd3b23fe4ba96dfc9a89536a99caa53bdf1df
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 11264 bytes
SHA-256: 3de572823738d500fc6e7b281cf8df37c03c5f4f5e6b146fcc513afdc0d69381

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