Malicious PDF — malware analysis report

Static analysis result for SHA-256 26af8ee3e2e6c2c3…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 15:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2461ea8d2dc83c8e228c4269e2dd7a16 SHA-1: b62532d0713e530693c25814681ecd6dc8ec374c SHA-256: 26af8ee3e2e6c2c3e2cdfa8dbe81e6ce21a6293f24c4e273848f34a9c7fc4609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crysiq.ru/uplcv?utm_term=f5+acca+notes+pdf PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/vijox.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1e6c2bc56b772b56a1537450881ce40f/dejodaguzowopazagame.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/3484260882.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/70986266516.pdfIn PDF document text
    • https://activepymes.com/pub/file/kudabovume.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/wiligokebivol.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50f9702a6---nogurelekisawa.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052702150873499.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e516e713---91755444986.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0ec9f3fa---fukasediserenotibi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841c72bf670---gepebapububipumeluv.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/bijigi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/q6hl8lrqh3o7gi9uq08gff78nq/nofowatebudi.pdfIn PDF document text
    • https://kildevangen.dk/files/watagesevexazuzabafotoke.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vapirewur.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160745af843cd6---toriponi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/kasasela.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe23ad225---15591299308.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1afcad86c---vejirenerafuzek.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/eamk015fjaq5neu6se7ldfu03a/makamuparenoripipelemo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/80159450452.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8ff3750730f1c5841ee6f19e65b1fa3f/pubemonoj.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9afbe390ce670c649a3a5ea3b0e14aa7/69059156738.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3da96881f05766ea9374391d9ac73dcb/tuvovobaduxulok.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/39184050476.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_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 18360 bytes
SHA-256: 235fa310317597cb4477fe152796f33bfc5defb7d7c6eb8e1cb78ea27b45acc9
font_01_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B6 10488 bytes
SHA-256: 1e0d0b34b22d65395fbe5dbb0d9cff86bfc28e9a0db093066daaee8f0f20396d

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