Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3a804672442dda…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 01:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c15207b371dc93f0815685b12b9b272 SHA-1: 2dcd5fa7591551dc10460cf04be26c102929fbfa SHA-256: eb3a804672442ddaba409dbb359bff66e3cf925e7cde83b4d293eb6b05a21745
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=avakin+life+mod+pc PDF link annotation
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834b18b826---95837744778.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/sexadukixozemi.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/723c9f3e708d8e8f1d5a8d4478a69cc3/27017716697.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/88153377228.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/27714753799.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39346297c---76990237253.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/muduxares.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/42606274904.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614110b297652---92050328515.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/penaxazulemimun.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/81a0091a9314a3612f4ae92801877f9a/35717076126.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/volewanap.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/kolefirisenisafa.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sifesawobibenuveta.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/62347743587.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/49622958736.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/lapimav.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/34570816977.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/jesazetipavodetamu.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/29664901621.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/63216901608.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614113446b0ab---29211796201.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1f8c70bbd668b99c38fb057c6b252904/bilaniteg.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_1222CB197645F8B5.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/mipavedifodovaladet.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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10556 bytes
SHA-256: 2b6ee2e7bc685f69e2edb504f81c008464f6b2dca0567e5ad04c8ade643814c3
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 19088 bytes
SHA-256: 7d109ef423d35b7a395cf96c0b11863fb2b41ac752f2aab96c84370ddf592842
font_02_sfnt_off0001357a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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