Malicious PDF — malware analysis report

Static analysis result for SHA-256 5826d745471ecb6b…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 16:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a82e22dbc2f3b694d14a58e2d5e3f1fc SHA-1: e75298bfd5425df09db472ac8b24e836ef0ed6ce SHA-256: 5826d745471ecb6b4ccef87e2ce92ff21176073a4d236eb4d0dc43543474e823
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its structure, which contains an image overlay and clickable links. Several heuristics indicate that the document is designed to lead users to external URLs hosted on compromised websites or disposable infrastructure. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101398d1fa---93275123491.pdf PDF link annotation
    • https://paroles-vives.com/ckfinder/userfiles/files/57209144330.pdfIn PDF document text
    • https://bagstyle.uz/images/file/sonasifaguzazofez.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/68055921858.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wafexubagewasededowar.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a7d9a970---61891741686.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/wigijivusesolepuvutoga.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9a2c109---mibenag.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/73594868874.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/77728599209.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
    • http://napiarsaigh.com/images/35251907841.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/xuwofifagi.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/nolisas.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f01a41f5e31f9bd5601de115dfd4bc6b/41955842378.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/66982424537.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///dusebidizegorinumibenofiz.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/64373630261.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/6372463959.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/63c11f5b5d431b72b1da3049e142a6bb/53482877330.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/dusulo.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/tirenedevugupedufiro.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/tijefumaxejid.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/mizasowazuferixeluxidik.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/noloziliboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=topographic+maps+of+my+areaPDF 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_off0000b4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C0 10756 bytes
SHA-256: e02cac1279387bbb94c8c4a5cf3176ee08a3cc54d4c9bd905fe57e95f1d0d366
font_01_sfnt_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 14172 bytes
SHA-256: 8b00b72f001557d6319a30da9f779e90236d684fdad3e0a2ea4a6e267e045d0c