Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8932d541e8df82a…

MALICIOUS

PDF

89.8 KB Created: 2021-07-20 19:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e30de4db7d91db5ecc467886c135168 SHA-1: 89502ebc3fee96c6fc2279af82a06271b514e79b SHA-256: a8932d541e8df82a445be9952466589ecf2f230826506e881b21a8753b008b21
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous external links hosted on potentially compromised sites is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b1ea47dc4---28411951551.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69f5c14f---57586273149.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3ba3a00b3---44528251357.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210618094347.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jqt315lm8263h8f2apcbirnp9u/ginuguwofade.pdfIn PDF document text
    • https://maisonforville.be/documents/file/taxanafifanafofo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cf103d2a2---nokudetob.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3afc8146---fusiji.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3482397578---86761969265.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/21726201902.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/12529940381.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/49183074892.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ednrlv35ug5dn0nqsk6fqi5hl0/kawasorexorite.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/39080533886.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ac18b36c6d6ba4c1f654e617b811c148/89624683817.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/nezif.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/fijivowidejas.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2297e827196c2a964a1cb9ac0ddf146e/3323362059.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d471609abf8---39215888318.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/2428391138.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/kasitojuvidiloxukize.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/43777125420.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/85447108c83f5a939ab04cf72cc39742/fepizogimotujejasawexu.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/sekexilufunujunapa.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097d28f86e26---totix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=boys+over+flowers+chinese+versionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 10492 bytes
SHA-256: 1cdbfb02970d74a037c791ecbf3eff32c25e1957883e33c355ffdbeaf96d7a5a
font_02_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 18312 bytes
SHA-256: 6b1ade299d826ea88aef26cf897af1d7092bc07334e36ce305ca2ab49a7ae3aa
font_03_sfnt_off0001528b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 1680 bytes
SHA-256: 221a3fa913c22cff48372543fa79cc89418e240d5d7881cabe37d1d382e5d52b

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