Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9091fac2a5327a…

MALICIOUS

PDF

103.2 KB Created: 2021-07-22 17:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f31cf53f6f605d0dfac10d0f62ca2439 SHA-1: 85f7954eaf2104d04d1a2848aeace4a54e3014de SHA-256: 4a9091fac2a5327a1766ff50b47c1a94c37b81224f7b41c6a0fd8074e1f8e49a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/lhml2l3i1jc8fu01f9ftdov0ik/bomeruvifavu.pdf In PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/edd9f9d9f36682ae494822679f519318/wosudagakorawapo.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/lr0o6dedp19es9brl9p9i3moa1/taxinixokeze.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78299be1b3---2911110382.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/tekosojevujefaxulakabaso.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085085643179---21897230330.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ff6d3a85---23648060813.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/romufod.pdfIn PDF document text
    • https://hse.tw/upload/file/patapesogeva.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/96g8g9jc17hbnb7tv3aej0lgdu/wumufa.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/25185393701.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4c1e71b2e09b16dbdbdd17338144644b/ropexonigiweli.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tabemerotizivuwukotudik.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160987625bca57---22115036273.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/42326009471.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/52744940611.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4774ce6c30---lalusadusolozo.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8e1cceb9---56320518604.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/wanuzeliwivozalonagom.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c9038ef9---53794824688.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24bd929e0---tirikukaxoku.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b0ba4941---93851172852.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/31888185861.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/3278315726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=answer+my+english+questionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 4276 bytes
SHA-256: 1ba0fe0285b99ef449d6deb6b585b6fbd02860c889740418ab36400af300d21d
font_01_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 17912 bytes
SHA-256: 98c958c1cb821f1749054dee88f43e41a8dc436f5ea25b120d7e6eca7cc53196
font_03_sfnt_off00013e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0F 21500 bytes
SHA-256: 55684d8f7c92ca747f35954a5430556759f668e4f0f4513225c457c1944f0243
font_04_sfnt_off000172f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F1 10820 bytes
SHA-256: 6d4d9b93adb0c39ff902cdbe832595bfb2a03224d692d0a406a30a375c0fcf29

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