Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55db31d3e66acbe…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 04:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb86bab44495a41a9999129b59c93fde SHA-1: cfc1788d3e338bc8690518cc37cd6a02cb586e96 SHA-256: f55db31d3e66acbe3558d6964184dc71b7df7fc9abb6f55d917495af3e3197e2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'invoice lure' heuristic further support this, indicating the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb86b30f37---bofulebafesekagomegorena.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aad1265d6d6---sinorivofibizipi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905c34f7fb---judir.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/88796458447.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/guganibufazitadidafosa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/q4j451vg866g8vjl5djjf9jtt8/13781102640.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/49323814414.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36134838883.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/59102725022.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210613_072106.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgqbcq24ke5gmtnishr53luvdm/dowekakadotokas.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/14283129093.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5abc59da1907edc11b5a94c2d4f75126/vigovekizirap.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210609065945.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/ginezotupobomin.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/57ca06e79a3c36e66e2b83cac16e8124/61026520637.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/41fe3c39b6490dcdc978841f0d8ff425/23776952126.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/91f3da72faed90854eff1b52e4d6ba71/babivodazusanupape.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/96vmbiibagodhbdets0q3qsh32/vamugilukutizogolus.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/11190143263.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/22777757661.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/retesegetamobonif.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/030557204cd789483367d3e3ffd79620/61557645529.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746eefa1396---burosimi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b6df158be---13130375746.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/k2e1rjlvnp25u58gf1r9816uh3/kixilokebisajobawirotil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=when+does+where%27s+my+refund+updatePDF 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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 10952 bytes
SHA-256: adb04a639212670b5b2be4b9c5a48047480d631b41c3e20b02712fbe051db583
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 17384 bytes
SHA-256: d1d03d9b592f61a8165ce70bb1579b195c56d4f979d58c4c31b8763e7ca13f00

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