Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba443443dfe9fbc…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 07:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3d69f847d22eab77ea7ac844a42fffe SHA-1: edc97648af471958dff62762dcaebd428f4eb2c3 SHA-256: 1ba443443dfe9fbc970836c8655a83642d1171f339a1d40eb9b0bfc8f755a251
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, potentially using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1a85c5e0---25999488495.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/wogodele.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fkapnru9c5pm9c7qdffgppf301/firerupo.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/24263446139.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3b3394f476281d777fcd1cf72b7e5516/95018957003.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/il258mqihmgc195hec7ivvqju4/98443166813.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fe8b769d71d6da50bc3b612aca63bafb/woxurutizevas.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/77289659602.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2513a85f796a4857c600d1fb5bca6248/79008635940.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/36554437964.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bb917367cc699b24193ef0404f796dcf/vudijulevijulof.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27b063bfa---35316614857.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6089d5840aae06e1e9e55d8e2253b19a/zifigaviz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b18607a8070---tixosurubekuzizosom.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/15150148884.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4ef75457a9d98a9a203afa05d53bce6e/45090396466.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/09f43806d07a9e9bc1388c14861ef32f/panino.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/91178764318.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/daluti.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2737a4ff3---mozaturido.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/limid.pdfIn PDF document text
    • http://teplospectr.ru/images/files/61646416324.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608845cc9adb5---xabazonujokira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+next+red+moonPDF link annotation
    • 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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10112 bytes
SHA-256: 52cc9e515cf74432a87f6391e1ae63a1b7a238fbe147ecc9c8c1c957cc2fc47b
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 17076 bytes
SHA-256: 5cef144ba4d7c929e20656046b3a38af9600703573c32fd3655b932e0c295d85

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