Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4e9294f6ad4ad4…

MALICIOUS

PDF

230.8 KB Created: 2021-08-09 06:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30146938261bba7a9a1172e84bf2352c SHA-1: 2005910df4c25fe3945e4b49e485c58e756ed419 SHA-256: ab4e9294f6ad4ad4a8c75c90686e28f2106460e07b8418b1cd1f6810eddca4a7
174 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and links to multiple compromised WordPress sites, indicating an attempt to deliver a second-stage payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to its use in exploiting PDF vulnerabilities or redirecting the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdf In PDF document text
    • http://maxidmum.com/images/upload/fck/file/55722304512.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaba2a4f95---83085103061.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/alftqbhovl0lfq78arc5tjrqnc/19082064110.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/94328359063.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c62d1c237---xoxazatutobuwofosumava.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608932aa6e3e1---mesonozumuv.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a37a7d9c0308e2e01b7670c531541e89/90791532957.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/1300ad629629b0dcca2c81733c3626d0/43642418369.pdfIn PDF document text
    • https://educhina.mn/editor/files/5599943694.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d679d486d2---93335217577.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/nojaruvokefatejaneb.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e97a50364---guwetunusagebilisabe.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/40306258769.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/kuvofuwimorojozubex.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc80dc83ce---jokewivivilet.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o4rn2k209cvk268brjc0l9tug1/vulabubine.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2e452422---95364929282.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/dolaj.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161108d95783be---xagibubexabemogujob.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3c8e46aa9---59130957862.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sugumedelenujobu.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/zagagoweru.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/23619677113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=resumen+del+diablo+de+los+numeros+capitulo+1+2+3PDF 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_off00032679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00033e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E90 11304 bytes
SHA-256: 88b2d85157722ecc94fe370dda28fe17388a37d477478bd57b674882d2e1900f
font_02_sfnt_off000358f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358F3 19448 bytes
SHA-256: 39f1c97e66e7d671a72392ab62da55fe1cb860c9eb47f64c818fcd13bdb0aed5

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