Malicious PDF — malware analysis report

Static analysis result for SHA-256 b875fd9164c2e4bc…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 15:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a8dd542871ecd42959c8c51b97fc690 SHA-1: 833a1ef62627505ffb6f73cd85ff8cdeffd50f7c SHA-256: b875fd9164c2e4bcdaa874b7a049271d4ab3cb14477adf70c3a10c0b98528d76
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=airsep+visionaire+5+oxygen+concentrator+manual PDF link annotation
    • http://dakmoto.cz/obrazky/file/66807103930.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad543a2c42929d28d855a95d81c13d64/9326632543.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043023063922.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be225478417---45837632630.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/58469928452.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/zetiwizupinulo.pdfIn PDF document text
    • http://floridainvestment.cz/files/file/webudoxumomobele.pdfIn PDF document text
    • https://kawanmto.org/contents/files/sefad.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/68714879444.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/vupasobofugaxokuvigafidu.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/90481191559.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c43c8dc67---bogegotogurusikazude.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816bc0c5685---17332183222.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a089f56fe9b---27713006668.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0c834419d26cd7f9207e6941ccdeaf54/88195614497.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/nafubozo.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/8732291857.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b837137a6a2---xexeziwadusavaxo.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/silam.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/xagemabosesomugumosofe.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/kikusepisejevugizad.pdfIn PDF document text
    • http://robedecreateur.com/img/files/72516688035.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/37d54698ef9fb3a1740f0174e1ee594d/vafujazomidezobidudixo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608515d8db87e---90275846071.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/80090397086.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_off0000c34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 16712 bytes
SHA-256: fcdcf7573685bfdd37222d18d8153ca5766006f04b6222bac7ff9f64fb47b4b6
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 11212 bytes
SHA-256: 60f754e09513dce631324074fe7ce39f83fecc3628b11e9df693a77cba79ef86
font_02_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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