Malicious PDF — malware analysis report

Static analysis result for SHA-256 221c0ddee63ce78a…

MALICIOUS

PDF

74.0 KB Created: 2021-08-24 23:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 788fcd10dc5967137949c1fb0766b2c0 SHA-1: 6f2598edd5a7a1ab8f8bb5df75bd8479ed6755b0 SHA-256: 221c0ddee63ce78a45e2f6856baaaaa0ed1a0095def0b4bbecca5e7873275f67
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://oshcongregation.com/userfiles/file/mivagup.pdf In PDF document text
    • http://stolizstekla.ru/userfiles/file/xegog.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/2671742188.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071154447fcf---84303409507.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082436040d64---38978266337.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/421da804796f8049078a291a6aa464dd/36561935580.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/82ee56673b7f1d7bcf2cb8cd7697938d/zobiripedazi.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/pepikasaw.pdfIn PDF document text
    • http://willbramephotography.com/72069237147.pdfIn PDF document text
    • http://geose.ru/userfiles/file/bomusagir.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/sisur.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e40df86e858b9e55ac3d812a3c8fcadc/80347660053.pdfIn PDF document text
    • https://scalping.ir/data/files/file/32067160815.pdfIn PDF document text
    • http://naviway.su/upload/files/62812357256.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zajinafekuwoburudefew.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c3d10bf1ab871e9de02db918fd8b303a/92831059197.pdfIn PDF document text
    • http://gr-chem.com/upload/files/84634795154.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080531b5f688---63054891577.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/41698508740.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/52931336905.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/zopasamakuvoxanupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tink+i+need+your+lovePDF 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_off0000bea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16548 bytes
SHA-256: 2dc4cd7c1c1fc4790d167600dfff6e6135605e6c43ccde7a09d884eca592e17b
font_01_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 10148 bytes
SHA-256: c6b484d7d36c7d54a55afb2fd25560cd866747ded0e9145bf48d72bba2af6a16
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1