Malicious PDF — malware analysis report

Static analysis result for SHA-256 6154ebc0bb40b5e3…

MALICIOUS

PDF

96.4 KB Created: 2021-07-02 14:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ded4edf6277a02784f71268bd0f8434 SHA-1: d0806af84fd9d0d5644f7fcede081706d3c591be SHA-256: 6154ebc0bb40b5e306c08db9db827fdd2dd296d2ac725bb87949cb6844fda7dd
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 WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique to initiate malicious actions upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://crewmak.ru/uplcv?utm_term=lava+beds+national+monument+camping PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8aeff85fee9d9869f6b9e81b3019523c/51459896831.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad41f5dc7ba---69644722439.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/mokuvufedizezibum.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160878aebe6800---38804070937.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/71925898870.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608466b8c2e4f---vizesobo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896ae422023---63266530121.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/16114416649.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nefijibogilobatogutukebap.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5aa8cda0f28ee269942c003ff81ddb7e/vusotekulapewatigefomu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fq8k6hf9im5h145hs46cthm3bk/79103083484.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3cc61ba6d2b5412f69bf7c87577bd4d7/jator.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/40476675899.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/91619135952.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079146d8dd1b---33416134997.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52244cb10---63810460820.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e9ab1053---gelilavabesuvagivuwaruf.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/62167656326.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/pofaregexisuzu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21c4a24c8---kawuk.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c960dfd6d07---32090015771.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/44469748002.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210506230106.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af77af54b85---33626702797.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/e3415lub3280h1b86b89f37oh0/lepalarus.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/7600095966.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 11020 bytes
SHA-256: 07534e9c6932d142cbbb8c2dd9354101b2d83d9f6db14c665ff4b8428af12c7e
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 17888 bytes
SHA-256: cb03c6d219748f0708f53d4f6505f5e8747990f1b55c13200112054b8cfc27e3
font_03_sfnt_off00015b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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