Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7b160af8cfc14c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 17:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 616852771837c83ee119bde1bac00a06 SHA-1: 2611bea689e2049391d895f5cac8dc46b9228350 SHA-256: af7b160af8cfc14cbdf40d6cca333b8e333d36d51f296e357514403320ab11cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. Heuristics indicate it's a link farm on disposable hosting and that it directs to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://55pluscommunityspecialist.com/userfiles/files/dunanakowo.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49d218fc9d---51113454880.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/jepizigatagofukivavujoz.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/890d49478cae3f0598e48acd4d8f7c5b/wifiwozu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9lpsi0ejjbgjflsmqp9ne98ma0/75152887038.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/s8jf4nf9c8u5h11pdb4j3e2bss/pijafepetatul.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160702329e9081---33525892840.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4592be09---dezerezewabe.pdfIn PDF document text
    • https://emmaushuis.org/pages/guvaledujuxa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/kilasirew.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/39409137261.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/erj25t3d0hl280p2lm9m1b10vc/juroloriduforolo.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/47431228953.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/livagakuposivug.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/01c010c56575a3beef8a54987ca4863a/kujevetotakimikoge.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/67102584736.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/tiwodogenunetuzamota.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/59755968525.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d935db1ddf0---4961460039.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/24252682031.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b5efd07504ac7b618208f4b9033ebb8e/ruwoferawizofekewidibuzo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bf628caf8---27960755650.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/tojumonegawuj.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cqvc6e0935eo3nhof5ihsddurm/lujigiwosorevorodeme.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/98275909318.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/37843084635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=free+time+worksheets+ks1PDF 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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 17472 bytes
SHA-256: c3a858b2a9327fdf79bfe147ce606445106b1f3a3bfb2e0c60249672eb6178ac
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10268 bytes
SHA-256: ede8eaeaad95cd9c42d72af14e26e1c2eada350208f7dd9b054c4b61a1ac9b80
font_02_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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