Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23dc033c003e5a3…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 06:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 611e2b40fbd940a1938df98ff261ac94 SHA-1: 4036a67d2dff1f23c061e828f8bc35291c00338b SHA-256: d23dc033c003e5a308671583df1afe3bc30db53fc4698f285cae7e67ea20f56f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. The presence of these links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4f061e31a6a96d5558b87c2ff5b7c295/68998190649.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af72064f3---61014140340.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ef21a30c---91000023470.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/98ab1102bdcbc8347d5fa54ac56abe0b/bisofubo.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3d0ec16c---silaniganitexiz.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/aoohsqh9eil1bi0lk9qfv7fvk7/43693865382.pdf
    • http://ahlhy.com/uploads/file/051859197962.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f500fd58---dagebeton.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099e224b40dd---koramajelaxogi.pdf
    • http://thunderstar.cn/userfiles/file/20210626235845146728484.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146c8b2adc---nigewofafobudugik.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd8edd7e81f8aa96e168c189f844e47d/44258470996.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5gu2532kaarq206cd9q6m07gi6/tiwurijodugenagifefo.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b5beea90e---demaletewufirafudatopedu.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba0a3cf6a---419450648.pdf
    • http://rogo-rotterdam.nl/files/20517004958.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/jidapit.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1235578fc---12255581361.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b597dc0c41d---39053135950.pdf
    • https://clove7.com/userfiles/file/44591066719.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/876b6d7f288c6b22ba622d32e28c36e9/9541452922.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7b01f87a74a245eb1db76e3c5bad4e6f/2653768308.pdf
    • http://yangpupark.com/uploadfile/files/31209245828.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mu1536cvte8jk8bukuafuak27u/poweb.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd16d8288---debivofef.pdf
    • http://mobilni-kadernictvi.cz/files/file/muzigizukugip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cost+to+install+well+and+septic
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 16792 bytes
font_01_sfnt_off000102fc.bin
775f4b19f755020c7edc03c0ff00a77c90de2e1590f8726e4f61d512ade2e939
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16656 bytes
font_02_sfnt_off00012e47.bin
ca8f84889131927c47bbd456a19e4a7ee6e24e05badeddb4955a28d61f65f3a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 10524 bytes