Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad1a57c21ba54f1…

MALICIOUS

PDF

108.2 KB Created: 2021-07-14 00:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2bde4529593d27224007c04101ee2409 SHA-1: ea83c06662ff4c45cafc56d10f49a3752a47b334 SHA-256: 3ad1a57c21ba54f15f88553621eec8c345bc33712cd7bd4f3ec7e9cb0391aedc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://imaginove.eu/data/Files/soxidamekufoniruzowubi.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e566a0d323---perujodusadolowugemopi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a8db2a99dc365b9e03d5364e25a88a65/vepezug.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xedufebodirurizew.pdfIn PDF document text
    • http://pvvc.cz/files/gafozefovarizonaro.pdfIn PDF document text
    • http://usmleworkout.com/files/file/41525591622.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/77722634734.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e2473ed50f6ccf205bdced993693b04f/56126823997.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d5b6e72ef03c66d7c3ad0a0247a2e90b/35985709114.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/22047162201.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3935d0a2---4441720269.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081759dd4e0b---nanigusuwapagabarasipawa.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/57061941238.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d837a9b6f7f157cd5bb7da23e3f03505/60138974674.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/55865836421.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wipalopif.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/86141942682.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/dozegapidujikax.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/mixirusexixewavalob.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/95470003439.pdfIn PDF document text
    • https://sambelteri.com/contents//files/21761173947.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210627015233.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/34280480391.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/71246721509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=open+circuit+and+short+circuit+test+of+synchronous+generator+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_off00013ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA5 11092 bytes
SHA-256: 8fd226461dc64a526cacf9e477c2cc93cfb30f310dceab36777adc43225e3f22
font_01_sfnt_off00015852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15852 18680 bytes
SHA-256: 026b1372853806acf730c0638e7e442ba60774db3711669fdb3b217e24d80f9d
font_02_sfnt_off00018aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1