Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4524c0d6d80cdb1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 06:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8f5dbf6b0e21ebb66ed3ee25a665617 SHA-1: 84722a6084ab00744d0d30dd7ad2595ed3e4130d SHA-256: b4524c0d6d80cdb11671481ad178f96b81ab8093d66ef0f227776762d666dd34
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ducthanhtam.com/uploads/userfiles/file/lemonoje.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e1d4131cf29629b542d7a90e8d2cbefc/mufawi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280836256113.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021063016120873499.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e78bc274131---90887561460.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b835cfb9181---54127457708.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/69549373280.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/pakali.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/pizonujifavukapibikak.pdfIn PDF document text
    • https://chptravel.ir/data/file/wopolepuwalofetaxon.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/meposunoreraxobofitag.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210823_A43D229F23063FB4.pdfIn PDF document text
    • http://aps-mes.com/files/file/ratas.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081db92248fc---sepumidofululozelufib.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/babegijumivukezowefokime.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210730_96009D1A47E943FB.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/gukafazapomebe.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8cbrld6db9m47c4sq0irjjalj1/bukakef.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/xareg.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vubibim.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/61475370825.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb053aec2---9174683955.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/fd368abe37988fa976ab05f619eb565d/kamikuxusatitumeboje.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/91751917783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=leamac+picture+framingPDF 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_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 17584 bytes
SHA-256: 9421e0d1c8fc25ba25eb4bf8d86f3ed13e6d4a8b5eefe3a3bb57372cca005169
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10544 bytes
SHA-256: 594d7554bf33aed03c3c0e23dfbf4cb65e80b58ed880add962f1c5082c417c03
font_02_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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