Malicious PDF — malware analysis report

Static analysis result for SHA-256 958aabd20cb58761…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 06:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba894d9fed3df8f23dd3f73514abe2ce SHA-1: 7d1f063e156c88507f62cc2af015bd4221ae1f1b SHA-256: 958aabd20cb5876136e330466bd81a73fe082f2415386353a89e784572dc92f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=watch+empire+season+2+online+free PDF link annotation
    • http://www.pilatesyoga.hr/files/files/45357569829.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/76548077380.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161432c347ce54---wexibedebeg.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/75246489139.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/rizulezagejetejoxevitu.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/memakavokirevi.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/11853429476.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475862122ab---widezexofani.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/51431667436.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/29195522080.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/55663816522.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miwalaxitapa.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/76564852704.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/94970004191.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091906014373499.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/wuzapam.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147c477e0a72---89314122093.pdfIn PDF document text
    • http://vaynhe.com/upload/files/puvotugiwixalu.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/rubimunafab.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dd524826---wokalimim.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/62584938745.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/36369773193.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/lewijawuwezexaralonokame.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/topexemuvoxozoxexorul.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10860 bytes
SHA-256: 3fdafc191a7a6e3a11cb76c388233d2b2a507b7a9aae60b7542b0aa130022027
font_01_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 17500 bytes
SHA-256: 6f1801c6970a6ce8b2733d91dc4fbbf730b083229103ef1a1aede8faf4745931

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