Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ca404c5406da19…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 12:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a5d56d65d41d334e851f4bb9c6ac439 SHA-1: cb66fe09faf044cc0bfd447896834a9832f68fac SHA-256: 89ca404c5406da19133800cb5f144b560f6a1dd402e5cfe06c6bf675bd299653
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially malicious sites for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613227684cb84---fotibixodix.pdf In PDF document text
    • https://ferropula.hr/files/75274547276.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210909_223627.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/moxijafudufeme.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/75734654078.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/2846070516.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zodali.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/sufodixodutuxigivoz.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/efr699qkqa09rbgg02e2i62ufj/78678500931.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae9038f4de---nofapuwopozipekasopa.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/729990891.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/88630981413.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/tobebaneb.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/44655591097.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/rajowilevutowipofo.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/93173854813.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/lasasuk.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/24180215565.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/gudifezevomimamanu.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zudirebojov.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/23428495696.pdfIn PDF document text
    • http://client.diffuse.info/files/21758466083.pdfIn PDF document text
    • http://precisao.net/files/files/mezosib.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/84254355746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=xbox+one+screen+mirroring+androidPDF link annotation
    • 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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10820 bytes
SHA-256: 791dc34a3461314c17bcca9896b525c01f03dce250180f4e08887e52115e21b5
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 18496 bytes
SHA-256: 95ad201edd19f3bc9b5fa60e2027105fbf617abeb16a794d6320f1e950fea28a

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