Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b51e77103eff0c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 17:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fac4c58c977c57e5a0ffaa1362c30ea0 SHA-1: d72bf54eb1032039782cb0b7ec2f1c3a10236a4a SHA-256: f2b51e77103eff0c2258b0c96c9cc8c589f2632105077b10db86af35cb65c8b8
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links to various websites, indicating it functions as a link farm. The presence of multiple compromised CMS upload links and disposable hosting suggests a malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=different+than+in+a+sentence PDF link annotation
    • https://xlspandoek.nl/userfiles/file/99350359671.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/ripejofujajotov.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a213aef9---55224576734.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021822_5317_190.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/90106794762.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7ff43160---70137312842.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/wumetogegixamel.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/40732071091.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c3aaeb4f709864e30762ec7464be6ba3/xaseja.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/981cd4e0f2a596936667d61f64dfa3da/703600812.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/36115970800.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/53308596913.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e85c8450908---88681128201.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2759320a---17048024833.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dc64e10a8d78889c3a8af61cbbe28171/lubigiki.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/tabozasajuwiki.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/18378102013.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/30400334775.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2218672e8---lomuxesi.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/18892158507.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a520f5eb35---retafezela.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8aa00700a8313339d30a47028007c32c/gabefagetewalimig.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/82199522574.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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 10268 bytes
SHA-256: e13dad4412603778163d55f241256a9f31ceba985ac283052ab988249e50dda6
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 18540 bytes
SHA-256: 9bc77d090212a867e4ac38ab88f2eca0f0e4f11336a89e45bb5bd59d8426e037
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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