Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b80cc4d3d96a0e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 18:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cfd148d6f4702d3b3b56085a869de02 SHA-1: 91dc9b6a1bb2eb14430c4cfdff15cd7ab3a9900e SHA-256: 16b80cc4d3d96a0e952e871d7622135a7398e1344f33e5793bfeefeb1ad46558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4f514b323ebdb44a4ec09fe15184df3a/mogewomadavubumuwebuj.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/74675019131.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/vemevonizabujijosofejowo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0898fa28a2---fizapikusukegomab.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/gawunorowo.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/36129269911.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/kikuzuposavola.pdfIn PDF document text
    • http://capital96.com/userfiles/file/34994158509.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c17aca8e8e24ec176a5411705bc9f9ac/80125102547.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e89903eaa039c79881ec7b9cc8f11cac/fudokovafewipekatozudap.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/xifafokufudujivuvemoda.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7580c57958---25868258787.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/guzowijutorerikem.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/iqgj4hakeol4i3v8dceer6je10/fopejize.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vidoparoruxekupimesowonul.pdfIn PDF document text
    • http://russia-ex.com/2134513797.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/wodulurulorevutogoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=viruses+bacteria+protists+and+fungi+test+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f76b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF76B 19256 bytes
SHA-256: c0f3dd10366ce4b331c386263de303bbc89b4476d377290ab9ec2421d4088d8a
font_00_sfnt_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 10960 bytes
SHA-256: ac3356ec72565a4ba310b6e89ff4fdc8235b910483c894108e5305d546d6d4ef
font_01_sfnt_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 15460 bytes
SHA-256: 8d143ba29cf5c951970ede4684e7986fc77b71f3aa4114df5b97bcbd2360a54d
font_03_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1