Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c197ae49ce836e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 11:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac2cf300f95f5c0047f7697f23bf641c SHA-1: 24c5dc12c105570ca02b132c8a74593ed96b3270 SHA-256: 59c197ae49ce836e6035b45ced61048ada70873cccfccde409a641612d976baf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic firings indicate a link farm designed to trick users into downloading potentially malicious files, such as an 'anti-theft app'. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=download+anti+theft+app PDF link annotation
    • http://dfanchem.com/upload/files/96644617053.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161412d9ce092d---kuvoremej.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/76429246598.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/fufafesafisomad.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5mbapve9e2aroafmm70q602ma8/tesekoxuje.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/30394471207.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/wizipawi.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/39483938011.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/7022510298.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/vojazikinebokotexaxebefud.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/popibaxejutinukiwijuvub.pdfIn PDF document text
    • https://ghnservizi.com/file/13416806770.pdfIn PDF document text
    • http://popeyebio.com/upload/files/sisuxifuwis.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/lagodiwuxowawipurebifuli.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/18839660986.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kuvexafudabekexipukufewu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142542af1a8f---tusugiwuvusulafelujuwoz.pdfIn PDF document text
    • http://venkateshservices.com/uploads/52454528668.pdfIn PDF document text
    • https://jensbrode.de/files/file/21551866908.pdfIn PDF document text
    • https://glozor.com/userfiles/file/zazibiz.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/xugefipilaf.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/29635427491.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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 10412 bytes
SHA-256: 684a8e9d8dba82b37f92ebf128ec8bbcc943b00b140c7d7862321d355077f694
font_02_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 17240 bytes
SHA-256: 29c80241986a7c604e8f74ce71848ba95ae3867a4281170094c2903a6efc90ac

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