Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fbf7c54a8ec9d5…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 20:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41356c07b27e9b8674655ab11ae2125f SHA-1: 6675cd4ff18a0038538278899bdd8f2adf321e11 SHA-256: c2fbf7c54a8ec9d5f2b7f435e0acf92725190b96f599461e032460e90b6254bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and numerous external links indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=centre+for+clinical+studies PDF link annotation
    • http://sivam.pl/files/file/54399283933.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4555f480941fe1035df28b1f243b659e/84460225612.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/26199616572.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/pipurixipobuv.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/e7g8dev8p755jgd5hhourfpbn1/gufefuravol.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/af4a5ak91itiopv6cp5d8raocf/maziwabenalejibiwu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d071528f6---91429011546.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f0ff512d5b3ade2e73c6d2602fb8c50f/52757982692.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0lhg717gtfjgjf1ab7rvehrfkv/pukakeso.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/86259823474.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/46060651410.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/duzebarenuwilunibafovabov.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b3fcd933d2501243aeef612f7d98465c/bejanadi.pdfIn PDF document text
    • http://chayka-svg.ru/files/sasumomajowonikipezifaw.pdfIn PDF document text
    • http://chikatere.com/Upload/files/32241123833.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/60700586647.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/lasawa.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/naxavomipasoxetet.pdfIn PDF document text
    • https://press-centr.com/images/file/90626083642.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/moxukuwogofawijezusob.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/8219996199.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2503b2b2bf---81622198140.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/guxotopodemida.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/gepalasubujixawejolage.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f76dba6f---xikukujeluvukejamuweza.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/30641839647.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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10600 bytes
SHA-256: f15948ddd39bf873677b44a93c15b125fd6f3dfeafb6810e5878e232990d6e80
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 17640 bytes
SHA-256: 45d2c3ecbfa2db278602a22213f7dffd039f225313770f5e2ff74bfbbcd50e25
font_02_sfnt_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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