Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e67c33adf08e80…

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 21:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f7ae5d5d8c8d9ebf4209c3149d285c4 SHA-1: 8c3a8567410cd48863671128669f2ae51a3e5805 SHA-256: 75e67c33adf08e8041a30e92d5cbfa74fd264e73b92d375ffaf9efa784222492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2ebd1da04f066306424033bbcf333b5b/47264967108.pdf In PDF document text
    • https://rjpexport.com/files/33955089547.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/18550048555.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/numokaxi.pdfIn PDF document text
    • http://sakra.sk/storage/file/46794524542.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/9171437319.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16079f52b51c0d---96884984202.pdfIn PDF document text
    • https://ebooksweb.net/files/file/36571846949.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/gopopinitis.pdfIn PDF document text
    • http://absigorta.come/file/24675159152.pdfIn PDF document text
    • https://kham.vn/userfiles/file/37675857855.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/bezoketonopedovoratino.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a73c23aad70962dcfd5bc7e6161a3f80/32486516899.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d1c1b24179846d8246ec434ccd9a293e/nexobew.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/17565547667.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883d56a49---54616055818.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pofalululirepefinivalolot.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160949521b25ec---wazeliduvusepozujeku.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/bigeno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081effa51b32---70807031281.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebf5f176d---gasuvulajilulepomuvi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/33070017203.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611640d1d8dbd---14662658049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=parole+crociate+crittografate+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 10524 bytes
SHA-256: 5042424fb17abf85d8e3398e274484f7abf0778ce2fb3552897790f63412ab82
font_01_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 20276 bytes
SHA-256: 355753b8d7f64ca019c938800694dbe3b4e164ba00225babd1c1645c920c9a0f

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