Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f772a0ce682846a…

MALICIOUS

PDF

92.7 KB Created: 2021-09-17 09:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8875898d86e59889ba6eecf7730c8693 SHA-1: 7e16371ac4f1ae2932d2c04b0bc74ea117e53e99 SHA-256: 7f772a0ce682846a1b43f8ff50b6b151f5a8aa7489b25c484472ba6aa1745be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=how+to+make+messaging+app+in+android+studio PDF link annotation
    • http://highendschmiede.de/highendfiles/file/mexipax.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/93628360843.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/82236647686.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/vebeguvotisanefelojide.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/3183861139.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b735e5e818---27755628976.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/k272agjtcusi1o5mo0a54m8qfa/totosuwusunofakevonuf.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/96678531033.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/99976282054.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/xaranagewimutunar.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/73666093117.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/vozaxevijifowoxemivowiko.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161376d3e6afe3---vitunetavumapiko.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bevegipukezureturasokuk.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/79161982346.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/gaboreba.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/bekum.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161311fe703fde---xotusixuw.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/maviw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf6d258eb.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47354dd7066dc47a250dd40809bdbfcf/sokunidolotosusigis.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nijejobinolodulova.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/72823099441.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/53454264603.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_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 17168 bytes
SHA-256: af83ba465f6a8aed48efb2bd8d0b905ac9d60fc10c2ec956f4406e9b69d880b0
font_02_sfnt_off00014b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B72 10960 bytes
SHA-256: ed44dd60c4f25e9b85c4fe98c5df1e86078bcaefaf0820b64544078b4a363626

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