Malicious PDF — malware analysis report

Static analysis result for SHA-256 61019c871afec7bd…

MALICIOUS

PDF

75.9 KB Created: 2021-08-30 15:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 060ca076ffad5c684def9b2146e76caf SHA-1: 28ea0415887c9be0f420c23e045baa2b0fbb8c43 SHA-256: 61019c871afec7bd323bdf225ae56865c263c9dfb50dbbdff93823ad1c703983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather for programmatic interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f1191016a2ee49634e68d9059663665d/76677494.pdf In PDF document text
    • https://aprilboya.com/userfiles/file/15820605920.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b934b9e5b5c---8977443711.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lilewumajobizazi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/xevizimuwavuxudopirew.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/lejuwipekejosuve.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160783a1a9a313---35792287988.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c6d6150f699ec1fdcdc2c2486db6a615/barubatividoja.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/depujuwakewosevix.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bc2d8b985---50316681437.pdfIn PDF document text
    • https://laps.pl/userfiles/file/famunu.pdfIn PDF document text
    • http://beiks.info/public/file/laloterikafajulitef.pdfIn PDF document text
    • http://runhouchem.com/upload/files/93998610087.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gd02kec1dn8ff9urhcfij385c7/jerisetizub.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fad58b452---78352701721.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112651388c80---risugirixudukamijizo.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/19489334449.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/lonepexipupopulogegiri.pdfIn PDF document text
    • http://c-amc.com/upload/files/67611787640.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a89df3c6770---nedopisuju.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/muzofupumaligetiloweva.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/wifefijuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+many+bottles+of+water+should+i+have+a+dayPDF 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_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 11116 bytes
SHA-256: ecbb5bbcae6662893d8d320644f897572f54008febc1fdc4bad94f6a7ec6f05e
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 16000 bytes
SHA-256: 6d6ab39cb9d6ebda1139e1fb6093fdd97548b1457f626810158d4ae9a6c6887d
font_02_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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