Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1f8f69a55f3b13…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 04:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1007253f2a2dcfb3a9d73dd7e0518d9 SHA-1: a7ef6d48d1d682871b1774cada11d844dd922420 SHA-256: 2a1f8f69a55f3b13b8c54a25dc2e11e4c6092c1184fce82b495bd525052937bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on compromised WordPress sites, as indicated by multiple heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous links to potentially malicious PDFs on compromised domains points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/29040b21207d45d2e4e94b5985366999/rajopapejidefalefi.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa48a84a6d4---magamunizuje.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/getajemibidekikomap.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5fq7p1vea01g9ghmf7o5guk5k7/rutugemelajujaxumiku.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a497796f1e---ranogubumapuvomifaremeru.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/vebigufoturige.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/49092846788.pdfIn PDF document text
    • https://badoza.net/userfiles/file/57685195927.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ea46cc2f70f4d5705da7c268dae1cf09/gemubotiduwe.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/68660967195.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/1615327502.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16121bbae44294---vajowewajimudabaxiru.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/godibuvesikerosabovug.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098002acfb18---malagozunev.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2ff2pr9dtdi9gsmdj0pqe5br6h/51151234766.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/14880740746.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160db754aeaf79---mavug.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/lusajapowakelejalax.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/60560935158.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/xawezidafusasozegopur.pdfIn PDF document text
    • http://cx-gl.hu/images/files/mekolikotamadeva.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-24/images/files/54721866395.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/39394013227.pdfIn PDF document text
    • https://12waktu.com/contents//files/54462901044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=word+attack+skills+in+readingPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 10632 bytes
SHA-256: cb08bd2eb82161284c733b68fd81ede0ca50c557dc5233c7dcf6fcffe35158f6
font_01_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16660 bytes
SHA-256: 2c34a0f921056dbd33a6fcec6e44016dee7e0511e13ab5abc8af339b1b9e85d2
font_02_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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