Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd23a72ef09b4d54…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 18:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b526fccd5ff396fcfd99c906b4f66920 SHA-1: f032a66d06c6172fe53cf3189b9da073b724467a SHA-256: dd23a72ef09b4d543034b08c81391fde9926ecbdac0a0ffc0a48b5dfe9c1656c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external URIs and links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple links to potentially compromised CMS upload directories points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=baxi+solo+condensing+boiler+manual PDF link annotation
    • http://budoprojekt.eu/obrazy/file/8151574851.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2efb9b7a606af49818fee5086a196f52/gezeferiz.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ffde4f9efb78dc9d02ddac81d744cb17/44245420445.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/vubuwesozawo.pdfIn PDF document text
    • https://drlanda.hu/user/file/vamejegilawise.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/xukegupetopogiwerepo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608187ba2eb94---39677516681.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/gakokusogoput.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081036466838---17825275666.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/zozisiparamagovofoxomud.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609203c021b0b---sugutajunofawututodup.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/38981878862.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nuvovuvujovakedinixunisi.pdfIn PDF document text
    • http://licausi.it/userfiles/files/damukarivonuj.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o35g61sadt14us5qssk7rsl8r2/wofulikilo.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/mifubenu.pdfIn PDF document text
    • http://indecomavo.pl/inc/77012920607.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/69481491269.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/lejererumezuxobavejerovo.pdfIn PDF document text
    • http://hasyo.net/files/file/wixarowuzufoxu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/mvhqc16hk7mtk8d42epscp5f2p/80581760836.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/fegazulipodobatiju.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/91065066603.pdfIn PDF document text
    • http://fitviewer.biz/files/file/mozirekanimonew.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_off0000c0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 15888 bytes
SHA-256: 412cb42bd8ef098f3b991eb188899233dca210a5b1dd9af22f92476c04898239
font_02_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 11012 bytes
SHA-256: f147bf42127d884430f00c065e1cc5fdb52d4bb5887ae0158e1d332cf28727af