Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac3aaeee8846f3c…

MALICIOUS

PDF

88.9 KB Created: 2021-09-13 13:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d23bec69b5c114cf847f38d0b46f837d SHA-1: d9bd3553958219b576657b69878c236bca315593 SHA-256: 5ac3aaeee8846f3c5aa604ea38175adef405b4c0187a230f3fd21acbefe1e5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=watch+movies+free+online+1080p PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3eaa112e---zejexevofuwopuv.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/19422214705.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/zerabobusebexujejofuzib.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/66bt0dqeo2omqmudlg20pe5j2g/17255315699.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b311e977c17509cdd6e6103298acbe75/27945421797.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xewazedikulinururigufon.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/27463226587.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/81503855814.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/jojenekafozitid.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/45841505468.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/50285268222.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/pifolenemigefamoluteri.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374931a7428---renogupafupij.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vorujadupuxav.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/dozegavopegunaxopidox.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6815cc04---fubidaruvesizekigiremedon.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109080127044474.pdfIn PDF document text
    • http://electric-kernbichler.at/zodadetil.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/dowazalirakarajarafew.pdfIn PDF document text
    • http://hiniceshine.com/upload/93230641085.pdfIn PDF document text
    • http://asqcert.net/files/files/75583427742.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/gasikonidawobojagebir.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/deduzaf.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_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 17596 bytes
SHA-256: 7694d8c504067765d455fd7ab5d10d5b1495d471b26eaf355355cd708a6e4261
font_01_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0E 11184 bytes
SHA-256: ec1fd343acedb31dc3273c4c5fbd21d209f7d7f73595d788524ad407940d7bc2

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