Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2f5902c00963de…

MALICIOUS

PDF

77.1 KB Created: 2021-10-13 23:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1302674c7e4b6eaf5c034d8bf5a2d73f SHA-1: 07ad0e7a06ba85c690b9ad0d989b7121b9f42519 SHA-256: 5b2f5902c00963de3dc88feeff128fdd85dc1b8eece1e31f4e0f0e88a49a811e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable domains, indicating a phishing or distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The file's structure and embedded links align with techniques used to lure users to malicious sites.

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://chukysovin.com/img-svc/files/jumotasiramasajabibotubar.pdf In PDF document text
    • http://allier-genealogie.org/File:/31297538921.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/46568456927.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d581d8ea80---65097879942.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/govizogejijusixexufeda.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-13/210913235043987787vzgpofhdledu.pdfIn PDF document text
    • https://italvaping.com/file/febefenuremog.pdfIn PDF document text
    • https://arendic.cl/files/37068971706.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/jinomebejanapigopu.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20211012_074244.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/saweminil.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/1583151922.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091220425285.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tiridavovilej.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/83521981467.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/perelawo.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/dasesimud.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161623f7c4749e---nasez.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/zalopubejukunipopapepalo.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/69522941993.pdfIn PDF document text
    • http://tianfonmm.com/d/files/kusamuzebaburelot.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/parolositinozupa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lointrol9p1brrdee174tb29j5/mogimubovokuv.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nojolalover.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=87th+state+nail+shopPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314581919287.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_off0000c4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FD 10412 bytes
SHA-256: ca917d067d7386911a27a5626d255c6eba2c9223bb50f6eebd70e0dc329e7ba5
font_01_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 19368 bytes
SHA-256: 3410382463b1f7df04ea45269e76e618e479a0771f4286be85c8f96f5d6c2a57
font_02_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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