Malicious PDF — malware analysis report

Static analysis result for SHA-256 875fd994d5178d6d…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 01:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9366e8d1b422c31cce5343fe265fb8c4 SHA-1: 2fe236ed35cfbc26036d65149e6c413f95f857bd SHA-256: 875fd994d5178d6d472b87095938318cb4fda3aab63682a59b34856c2b4de747
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites hosting PDF files. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to resemble an invoice or payment request, likely to trick the user into downloading a secondary payload from one of the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55324d9a1---mibolujexuxubevet.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fb45afd9d80a01e646d392e888ac8fa9/7564627911.pdf
    • https://datawire.gr/files/files/xudifulesoralatuxaf.pdf
    • https://quangcaowebsite.vn/uploads/files/vuwedidufejokoduwozulefuz.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa71e0ba3---17327831705.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160861596c005a---pedasovarevariwubukalexev.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24dc26f5f---59409453673.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e124ef662bb2718a301e143f5aa69aed/kexalorubizavokupame.pdf
    • http://billsky.ee/files/file/tolonosonuzud.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/73547e3280f23afa82ec9519ae973780/37828805036.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f90d1ae367---wonenebasovilugopofime.pdf
    • http://yule-sign.com/upload/editor/file/20210603203834.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fjopjfc0rd10kq96eb34bmlsu6/81868025218.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b9493172f610748351aa296f1548942e/55138053451.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d909fe35f0e2ef478eeeb863e294ed72/78148586409.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qjim6pea895hm35df1tchs7oir/jipadegesogas.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c45bba422d1---3791971894.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a22k2rofm3l46g9t4lnjc0h1d2/nigotetenamobosezomojefo.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/10c2e66137ed1f92930978f939f646ae/93337711008.pdf
    • http://beepost.vn/upload/userfiles/files/botefojuvenerawopex.pdf
    • http://czdashan.cn/uploadfile/file/2021051512454773499.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2s1cgqb3ur9k6g4fp521buv6ft/koxosejitovalu.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab7c956231---2960886298.pdf
    • http://ztkammer.at/uploads/file/9957022255.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebdc5a246---16136572392.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=accounts+payable+in+simple+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0f.bin
be034b1b9184722a835facb3e5687495c11a989317cdb6f71de947efc03eec39
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 18932 bytes
font_01_sfnt_off00011d5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16792 bytes
font_02_sfnt_off00013576.bin
e7da45e8d692a0f24e4e62b445100acb3c7f5e1df6d2f38ec2afba58abdc1984
pdf-font-stream PDF embedded font (sfnt) at offset 0x13576 11096 bytes