Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7991143decb60c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 00:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4224ea385634602eca2a1577d09fe79 SHA-1: 7a00212b87aa59476d3e9b995a15ab4a9fb9f16b SHA-256: 9c7991143decb60cb0b820d5fa54afbe773ae4c85921f25e5d04a00732bffcd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 http://canhtoanland.com/upload/files/nigolibejinuzuzudonofodu.pdf In PDF document text
    • https://liur-krd.ru/userfiles/file/newavixunetuvatagepeji.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/8115498103.pdfIn PDF document text
    • http://recviem.ru/img/upload/18393287972.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16125fd5c3b6c7---badetok.pdfIn PDF document text
    • https://securitydm.com/slicice/file/43216816844.pdfIn PDF document text
    • https://cargobull.cz/res/file/fizul.pdfIn PDF document text
    • https://teamcode.net/upload/files/fozifamitom.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c4jakp6vj2dljbsjafed54qu81/39971345531.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/setefuliwelenukabojugegon.pdfIn PDF document text
    • https://auto826.com/uploads/files/11658806037.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160731ebb4f1fc---boketojoxok.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddff717c2b5---21725409704.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/nabivokuvijukaf.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/muwelipafo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1ac78916---powaboderepesififar.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/55099099394.pdfIn PDF document text
    • https://renetravel.ro/images/files/robifoviziwuma.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4db2e69fd1---89392935442.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b07g31ei91l9aa57u778073k13/29993637810.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/edd5ba30ce9e439b2f6e0593634e6278/84807970145.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/mafut.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kfoqhiimqi5ggd7i30cbjrrip3/mabodubexovidesarukoveka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=compensation+cess+meaningPDF 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_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 17068 bytes
SHA-256: f6dd398d3c45975172ae29d8ed85f007b059e2dff8f5d0cb5b2284fac4a09fbf
font_02_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 10604 bytes
SHA-256: 70d10f57d048c7cbb58708919b123ec050bb382c3161783bce848cc9716e9ae2

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