Malicious PDF — malware analysis report

Static analysis result for SHA-256 938bcbbaea92da48…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 13:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84fee0de67841c9c5a539f29e60ac458 SHA-1: 14490b2cc83b4e316bb5999fb06a0e6f4ca549b5 SHA-256: 938bcbbaea92da48b4424ff73f9551b55cff137fa7306d1ea5d9befc786d119a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains multiple external links, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure and invoice-related language further supports the phishing pretext. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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
  • 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://allytemp.ru/uplcv?utm_term=petty+cash+book+format+sample+pdf PDF link annotation
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1346dcfcba7bf5acc6267a7266f77593/tebekup.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/91644003a6e7686bedea41523c540f64/47521498742.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/709eacaf032fea1aefde36272cf67569/varel.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/13783960659.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/eadkmppcdlltdll7o2ud1h984b/wasegewizaxor.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/todojafuwimexuwiseg.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/70267788166.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/legikomusufos.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/64535721655.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6200b8b2b---gisumuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b308b949---fosopixojiwodasij.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9ff36064748970b1eddc83dcc95e3e8a/9401342888.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/doxikosiwalak.pdfIn PDF document text
    • http://mfahk.com/upload/files/45399340319.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b717a42b6---31429427044.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/lasutalaberijekepefesir.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/17206661213.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/657084f5a9d63b34bf8e5a940e6e349f/juxira.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/jikofokipajefuzijutekoroj.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3badf037b---fujumidopagekasepevulubu.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/11685245967.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/13247547730.pdfIn PDF document text
    • http://lblussana.it/images/file/28900281988.pdfIn PDF document text
    • 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 17532 bytes
SHA-256: 70c093ff460e17830a7c253a3a494a22cdb1b4a9bf1d8ea037f34bde9b1c14fb
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 11036 bytes
SHA-256: 3db1fc5098f553fe2c05c8c9ec619236c59cc9a1652e0208b061012b20e4d2c8
font_02_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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