Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69a1f8470934af4…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 01:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26574d398a88989f03b99faba66c1213 SHA-1: 6d91aa29ce9342728a172c382d0a8c87a02e8dab SHA-256: e69a1f8470934af4459ce0fbecef6399ece9c1209fae3fbfa6ac64044eb29935
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lure users to malicious or phishing sites. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://nomylo.ru/uplcv?utm_term=android+phones+sales+statistics PDF link annotation
    • http://c2r.su/uploadfiles/file/2021091104430273499.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/57051342906.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/2284731389.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/xagakuj.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/lamufaroxeja.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140053c6cfec---3736853685.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/lesunapovefifemafune.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb592cf1c---kasug.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/5866363018.pdfIn PDF document text
    • https://istanajp2.com/contents/files/22102481723.pdfIn PDF document text
    • http://bresky.cz/res/file/sumubozigenuzixikafox.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/falizinifekusiwu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07efbf5e0---fuxofarenifenomitet.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/romirudakotutinezito.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/vepukavofudi.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/39877895516.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac747b05f5---dofuduretosara.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/451138558eb41fa8ee77ea12d96a72cc/27519747938.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2e4fc95d5d88e55623dde10c19ea0ba2/39846790141.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/timojusodegoditekazi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc1cc9ff98---89093371459.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/61713848451.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/56697072656.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/zepazu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140689d6d104---12782671893.pdfIn PDF document text
    • http://ibb-online.ru/f/file/80998183535.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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 10592 bytes
SHA-256: fea1d733ff9485ff23ec2f31c01c302849d9dab85334da6318dfde77bcd47dae
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 17832 bytes
SHA-256: 6f0f2ce81029dce4459b036034cf662478363ea861806f719fdc9984305aae6d