Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6d612d2b0b0024…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 03:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2a076fe2597eab4c806ca67303a3956 SHA-1: 75de87a3ca1d71ca420b2eaa19688f3d87b20805 SHA-256: 9a6d612d2b0b0024a0e7ecd34bd6038901e4c4032bc0b11799709dbcd6de330d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The PDF document body is heavily obfuscated and appears to be malformed, suggesting it is not intended for human readability but rather to exploit PDF parsing vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=unhelpful+thinking+styles+worksheet PDF link annotation
    • https://kristinanamaste.eu/files/pofivaji.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/saguzofiwanox.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a461d6be25d---ranarojalirifate.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089464a957ce---mijozozakumubavudogofufi.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/dojujofuwase.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210509152200.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/46707282736.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/sazidezebojejaveba.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/futusunijubobunagek.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/namiborenapiwulakomub.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/28790036129.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/zutiralife.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/wonorazatitazovuvebo.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/9717474709.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/625220958ed8ad08eebc15a86d90bb4c/81341687354.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab2b5fe0a---kofuzowefafot.pdfIn PDF document text
    • http://apex-architect.ru/images/file/tomizamotazajelonuxava.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zeputisawajobatisu.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/sijaj.pdfIn PDF document text
    • http://df-foundry.net/d/files/50734209377.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c156dad993---49896627475.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/64552986739.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607331cd7ccf2---mutepisajanitizosimowa.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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 10872 bytes
SHA-256: 2c4f02700a2df3282b1eaf6e1912e85313fdd9e017ca7f4db6373681b7483667
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 16904 bytes
SHA-256: 1de8f7bd4d95837687c91f1621a675d211e0f4fd49509709dd2bed5889996307
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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