Malicious PDF — malware analysis report

Static analysis result for SHA-256 55430a4792a4f677…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 19:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 68f444a695f28161a536206f5c79d6d8 SHA-1: db125feb3b58c89fb5052c37c295d9e8fb567403 SHA-256: 55430a4792a4f67702635076a51fd70fdff3275e1530a8ca6f934d9b5b169c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=what+can+you+watch+for+free+on+firestick PDF link annotation
    • http://friulanapanini.com/images/file/50294590515.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sk5m2h4bhjob8b8lossavtld99/51508079719.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d19c844277607bccf710f0f1b9004053/fesenufuvujenebarowalem.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/87146220348.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/37179263744.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tazitagojojelawejabemufuv.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/savedupaniduviz.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/edeac9dc75047f04d0290bba56b1d98d/78976298798.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/41013088698.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k8e2b99oi1s5a88cjaldg9hfdi/zababowofukobugamus.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/96592637546.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/suxunijumufe.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/60678123226.pdfIn PDF document text
    • http://gensugroup.com/upload/files/voritem.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/54109927625.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/gewazadafupiw.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/15405192209.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/87551795816.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/jafag.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///20985148872.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19437464222.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/navanolinitaselud.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/37928963045.pdfIn PDF document text
    • 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_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 19168 bytes
SHA-256: bda3a3d3aa359977bc9b4e653bc0a8429a4d586f4aeb288747fe5ccceac95824
font_01_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 10772 bytes
SHA-256: 90df7de29728d98cd27ed0069bd22af486dbb4fd5d7c468cd208dbd04c12cc2b