Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4513fd3c85dcd4…

MALICIOUS

PDF

85.9 KB Created: 2021-07-20 21:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e051601c2eea9a555d51c0d8cfc8ce7 SHA-1: 2bb138604bcac3b0a480c664dff8a8a6610f02f2 SHA-256: fd4513fd3c85dcd4adda424e26d60a9eb9e06bc817a2489b51fad4583ef25200
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0d4nd65ig73o5ek8jt36pq8hag/4389865583.pdf In PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4172ac567c7267942d0240c8c508b2c2/15159978520.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5lm37m76cr4qdeqd3cgkr9n2jq/girapiguviluzemoworutelil.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/bimesigo.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fuvepufuxirozixojokufunil.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/33344b3af8d0dc89dee7a90afa9d09e3/61281627325.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3d586a2e6923c0f5591b31d588ac0e2a/sifezitozananot.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fed5755a70766891aed03a824fd865c7/gorilofujajexege.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/mowevokusuzetalo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/h767df2kj962ftl6t41jqbt6m2/gupuxirufurasakutux.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/83497834098.pdfIn PDF document text
    • http://zubrcup.by/files/files/38807663108.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2d726b11---54184441102.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/35066516274.pdfIn PDF document text
    • https://mfdesign.hu/files/file/rasetaduzewizer.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3432ad5d6---pewuzobesixa.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wupudewuzedipepipup.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2928f4dfad---welefuz.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/jabapovozijif.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f31a3c0c522902cf79a5c70ef6675753/rikadujofiduzalufed.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075d99f9194d---1261292817.pdfIn PDF document text
    • http://446888.top/userfiles/file/64440251979.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/befisitup.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ratewapawepufafegojupep.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/08b01f71eb581b2090223987c861f17a/21435987904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cbse+previous+year+question+papers+class+12+physical+educationPDF 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_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 17204 bytes
SHA-256: bafc4fb2f0992e12caa9c317f0cfcc39e489b91816cd82c438fbde03da5cfcfd
font_01_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 11380 bytes
SHA-256: f9165255be8aad16ec1ab70db63180f38d616ed8161dd802428f5b38318502e2
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1