Malicious PDF — malware analysis report

Static analysis result for SHA-256 64599d8566cc3d6f…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 21:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7116804abfdc693a7ab1f78d37bfa74 SHA-1: 1c9d4bc620ce4b7a9281e3b639e45e73f487c62a SHA-256: 64599d8566cc3d6fc0ca5a9b39e2c20a1754ec14cdf8e5af5f139bdabb0aaa57
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tcgardening.com/userfiles/file/2021080308120373499.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e595c638ce504d7c8ece9710985361f5/93736436302.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/74qfrmj6ugqdoh3galmi8ngdu2/fifugonuxixudotawunilad.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/nibiteramuvuxesul.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80241f027---42272381155.pdfIn PDF document text
    • http://imaginove.eu/data/Files/45888950835.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/94468700073.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/80332636660.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210829180852.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d52c285075f79596a766d1c7fa98c749/zipizuluzo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/xodosuwukajak.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a7728a11b---39678631038.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbe687d07---bizojanalipajajasif.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/tirazizomotutateni.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fda738d5bae---damid.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/gonus.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/86227474591.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/lmbr0vkre4c8egdso1ev9ng1e2/40109429712.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/73877109667.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/86937855488.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/20127bebecacf5c06d10e05da1c0210a/xinamu.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/pijunekafube.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/razogutinefiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=escala+vineland+de+la+conducta+adaptativa+pdfPDF 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_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 19016 bytes
SHA-256: 129de0881b68ce7799e05bc689544da554b5e18ab93c8f1c4178b264d96fc220
font_02_sfnt_off00014790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 10660 bytes
SHA-256: e3db760f408f3be5b932093d47130e7e14d9d73ecb6ff114fa17228170ba8017

Open this report in the interactive analyzer, or submit your own file for analysis.