Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c16bbf565cb4b4f…

MALICIOUS

PDF

86.4 KB Created: 2021-07-26 03:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa3453c4822386420fcc8e05c9984e44 SHA-1: c4b0a5c3ac1bf39f2e3b99114fed935f4d95b05d SHA-256: 0c16bbf565cb4b4f9491c94e8db79dff550e04cca3a101756e2da29d971fba0a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tv2np4u6bt39h9lckkr7tn5vp6/jafalowoluripozutofe.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160725039c7003---guwozixomef.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/rawuzuloxefifobuwiwinu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef3fe859a---metumuleribasawokivokex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5ef132e52---luzemonedofisowijar.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/48919922498.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/tajuzubedibax.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/wumupetegabexofipum.pdfIn PDF document text
    • http://metapolar.hu/tmp/jazijonopowimujonimujid.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b11596ba6---49813681480.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/lojekotil.pdfIn PDF document text
    • http://kco.su/userfiles/file/zavudozenuvinom.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aae025e186c---ditolegenixomidakojonimuw.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/lvhpnu4b16pm56m1dph60v5o01/mokupewovaxaniroviburav.pdfIn PDF document text
    • http://hzqzg.com/d/files/vonulojikinabu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0554946d7---dalenixub.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/64689634275.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829772dd2e9---boziwowezafuxesufin.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/2s1onr55qduno5osb69h2e9fd0/80792463053.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/99702832081.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ac02d7127d580018200004e094c89315/fogivutiwom.pdfIn PDF document text
    • http://elm3rad.com/file/29155938492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=letras+del+alfabeto+para+imprimir+grandesPDF 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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 18572 bytes
SHA-256: ac8aefd7bb43be7c46de4af878c626be6ac1a6a954d238f2a93cb197fe6d9412
font_01_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 10940 bytes
SHA-256: b6302a4dfd27cdc26b4af6dd878ed74c747edc4f3483119334c6009ec2ad44ce
font_02_sfnt_off0001310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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