Malicious PDF — malware analysis report

Static analysis result for SHA-256 d222cabdc028b441…

MALICIOUS

PDF

80.1 KB Created: 2021-10-12 01:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6240977637395300f6b18d70a0c02928 SHA-1: ab471ee02bf1da9250a556e1e68dafcdfda80b0c SHA-256: d222cabdc028b4411401ad80eb0efe8b2c30f2ef657c68581a3979becb082410
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to manipulate search engine results or direct users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://toscanafantastica.com/userfiles/file/50657487246.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68b6dcada486c9fb288ff96850651893/xodesawumuni.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139838b8326e---82319538618.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/kopulujotox.pdfIn PDF document text
    • http://popmetre.com/news/files/68818354177.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/17631270585.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/ritifiripazozixu.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/xufajofulorig.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f81b558678972c48e355de851f7c5d1b/losazebigodaronu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/tumovoxagamezexogutu.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/94252488389.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20211009072414.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/fuzoj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bk1eon76vmta2cm5d31mk045qi/22245738236.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rudab.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/72418484731.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/batugatav.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/mejesuzazimeg.pdfIn PDF document text
    • http://jaqalsports.com/files/file/41768641776.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/gonisewu.pdfIn PDF document text
    • http://edeins.com/userfiles/file/23247505498.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/zebijitifuwato.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/sidagajoxotugubadevivad.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/77922816565.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=how+to+make+a+high+level+enchantment+table+in+minecraftPDF 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_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 18388 bytes
SHA-256: 5edd73f9492e443dfe695fcb9d9c2edc57be4da726c9487ae92e81f82f926c34
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 10992 bytes
SHA-256: 6744b52d9f91d00a5bcc0faf9a4fd16008383b24e1d37db7c9be7952d96c084e