Malicious PDF — malware analysis report

Static analysis result for SHA-256 544579d001b7f5c4…

MALICIOUS

PDF

90.3 KB Created: 2021-08-01 19:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69cceca9dcad1825e530780af8d0bc83 SHA-1: 4bc53d3471552307922a8cf8818718a2028d998f SHA-256: 544579d001b7f5c4fb721ea8309389dd4aec149d33d4edc1d2eb2bafcbf51a17
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document instructs users to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=tamil+devotional+mp3+songs+free+download+zip+file PDF link annotation
    • http://alnoorcity.com/userfiles/file/fakupakedoxanomo.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/67712632747.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c550ed4b5df---3028280544.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/98616131663.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/kion8d66urm4h8i41kf1ipjk3f/jinabonuziligofu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/97855959124.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607571496d295---rodekitariwuritazus.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/70310623939.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iic6bv2h5pre96fsdgu52l9mac/nuxarigon.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/wotobezipifilofinazajokuz.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/79027814028.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3529e740---227657354.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160963f5b27a2d---94687321137.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacce9024f---fasudeto.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/67582424477.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941154172c0---82288452694.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lpqtpcvir7gtoma63t2hih3svi/doxijelepisofodakaza.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-23/20210723041237190707.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vatanunur.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0toospq5k852fkmrpb92un29ma/59663890757.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/kubipiforasoxofajevosiwur.pdfIn PDF document text
    • https://latework.cz/soubory/24445755116.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/giru2960b3v0cv7ht21qisk0su/6554940295.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/18547339115.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/diduruzux.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/c06g77efqovf5nnute2rd4p3es/nimajubib.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_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 11188 bytes
SHA-256: 6687495a5bd40ce5eaa935c6de567d3ab96b493d0031a4570ee64320206ef2f7
font_01_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 17064 bytes
SHA-256: 1975a03b4179496ef5b0fabc0ace7290350ae105323b67e08781551a367b6ff0

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