Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28afb0797ed8cb4…

MALICIOUS

PDF

83.2 KB Created: 2021-08-04 22:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: edd7175ba29d0fb0f5d8596881c608aa SHA-1: d5c603d768835f656ce8a8d0f8d3909466d862bc SHA-256: d28afb0797ed8cb44a5d34f37d37274d4ae781b0f84b61637d29c2dabce6f4d2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous links and the use of UTM parameters indicate a potential SEO manipulation or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8660

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a34e853ed2c91b479421f24dacc94a74/separexexuje.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nnr6d6054i633hisru37ts3gb4/jusemoniwuwerub.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/83494788796.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/23768202915.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c1361f2a---14565602856.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/38020933866.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5de6ed3f---jifebupugogituporimiluz.pdfIn PDF document text
    • http://synowka.pl/galeria/file/7216154700.pdfIn PDF document text
    • http://agama-rc.com/upload/files/99678979023.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/gufevigan.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/fenumujojulov.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/28671881260.pdfIn PDF document text
    • https://aashianarealty.com/file/vamarugorefojidavadi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906aacc0268---lawedetuwilonoku.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa118d139a---dawefafe.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/65230881092.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v015savkebkdn0o4uf6jba428k/33006779262.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/14505124366.pdfIn PDF document text
    • http://falerisztika.hu/tmp/temido.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e0900905857daa4e3059b799d2e78318/7824443319.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd53e82eebb2057807b16e60774d6dda/95081032866.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/wawaloxinowewu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf06725ff6---xaxamixamaduvisumod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+download+gta+5+mobile+free+download+androidPDF link annotation
    • 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_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16572 bytes
SHA-256: 9f70777f2f5dafdebc55a7db2f9286e5b4ad9cf4e8c192ba06cda2b74dde65a9
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 10880 bytes
SHA-256: 58acced62d034a53b776429b64bdaccdca64204d3529da464a49cbc34554916e