Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b1c1302230d078…

MALICIOUS

PDF

94.9 KB Created: 2021-09-06 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e04b17662120b5b70399bf27f56785ae SHA-1: 8ab4675f1f9952c187d4bbffd37a57b3d93d9227 SHA-256: 81b1c1302230d0783fc1678869a048b6b8fded5dcc4ff8bbb95a8f0f3df41ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://epwuae.com/userfiles/file/madatavewikajetuwumamel.pdf In PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/gakudojasipuwikijoxudofu.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/44937137415.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/tonujijixiwumun.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/gurefumixuxoxu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/lofogem.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/dedagodibifavugorimunu.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/dasemonorubuneripidawokaj.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c336605c2af---jugibukuzavad.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/87229474403.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zujonenonuzukakosojux.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef03c49306---gowizujukekivipigopiwa.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210726_691F5A4D58F23AE4.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zijikiv.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ma8fsesttfq6ir563evie9p9p3/zijakuriz.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6971e4d8---91557878860.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/55326230295.pdfIn PDF document text
    • https://cargotavio.ru/files/file/15673139599.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/4298762426.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/mizepipisi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3dc20bd984b896ae9724badafed5fac9/fivigebupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=composition+of+functions+worksheet+with+answer+keyPDF 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_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 11124 bytes
SHA-256: cebff9f29a62208ba3892ce89a5b52ee11db64f8cf677a0db472a5a522407565
font_01_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 18900 bytes
SHA-256: 70ff4b8065c3d9e5d026dc506d75389ae7eac4c1a60a9d084beb5d316db9c33f
font_02_sfnt_off000155ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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