Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdeab310943f4aa3…

MALICIOUS

PDF

87.8 KB Created: 2021-07-07 10:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d267526c23a50411ad188b93548c113f SHA-1: 0a587732014a1e217c1bec9f45f5f9835c2a8119 SHA-256: bdeab310943f4aa3a70f80f8da964bc3f08a4b2dd4be2cecb4edc25427a490c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=sample+letter+requesting+participation
    • http://bfr-bialapodlaska.pl/userfiles/file/furimudoruwenodu.pdf
    • http://ahxxzx.com/userfiles/202105/file/50721297717.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf382268799---nuwufomipamexuxexelutez.pdf
    • https://hosvagyok.hu/userfiles/file/87236733759.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bdb642f11---numudefosawunuzanumigag.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6533a7bb14---wolawasij.pdf
    • http://toicodonlyson.com/uploads/files/xinogirepukevijakalutotim.pdf
    • https://stillwaiting.org/userfiles/file/11146474053.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fimerafon.pdf
    • https://carsen.sk/editor_uploads/system/files/gidofaja.pdf
    • http://vigova.com/Images_upload/files/naninanapulasewurojesi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ec896519---43880075853.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8004ffdad32b1a0adbb08f7d8041860f/63568525300.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/47839700826.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756a1f125c3---28684667403.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fb8cbfe3201ef2e2fa4b9b337364f91b/tesasobutupupup.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac399b069---fobexopobilufapuzuvekasam.pdf
    • http://manavpublicschool.org/manav/userfiles/file/44142644196.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1343b41736---61054454683.pdf
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/42910524714.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/5900653217.pdf
    • https://ceccarbotosani.ro/userfiles/file/56685936487.pdf
    • http://pinturasoltra.com/images/slider/files/28513762949.pdf
    • http://elcampoeco.org/FCKeditor/file/nobobevefiwufum.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0e8686a9---35069930924.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ad3c6551---winurololujibo.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd21a71f4ba---59228500249.pdf
    • http://retailcop.ca/files/kexewofo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55b.bin
0bd17b56e88d34e4d0a07ad1935c006ceed4d1500c29cd8d3a5230e3e0344b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16504 bytes
font_01_sfnt_off0001202a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 16792 bytes
font_02_sfnt_off00013841.bin
f85d9c8cd584ffa97ef222a952dadf367332eb3965ebadfc61821f798c56aa64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 11040 bytes

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