Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a0c48cd5a01b05…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 02:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f0646f7a1999784aa618d411087320c SHA-1: a38a8a418c2a10d44fcec25a393782f1fdeff1b4 SHA-256: 22a0c48cd5a01b059eca2c634c4779026628f964c25500d751b128cecc75f919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to lure victims to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://alutat.com/data/file/bazusixinixiwozijoxuv.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb222ddc75---luzezusuvosawox.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26006852928.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/19/80561709769.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/q86iqlgk73ea6ivn6t7kjgjr54/nifuxuzarubejawuso.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca406f1d63---gejogedorikolif.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4390c0a4748238fe063be58064c5078d/fejemotofixaxoxa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad438fb8f---58718051483.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/kuwevodisobizanar.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831906923d---97300381793.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08aa88f48---96004919243.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcab655f637---17352232373.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/wiloputug.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/punofavupogekojuvaw.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pinubatujodabi.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/jizojibinajubepug.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zadatevonewel.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/32656168794.pdfIn PDF document text
    • http://abnicum.ru/files/file/23227826880.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e6e4ae6a9a5ba52130735cf3e3f0805a/pipoxosopokipefol.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/goxugi.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/27423832028.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/35124798644.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9de14fba6d6da6e33a04bd256bd9c02a/rivelotomalopoj.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/b0dcfa861a1a10205e375d3d604d29a2/35728292076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+godfather+francis+ford+coppolaPDF 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_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 17376 bytes
SHA-256: 4ff7213564f44914ac392b4e28c34664bbcf027f436e229658d58dbd8e09b82b
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 10864 bytes
SHA-256: 264a21ef6b262a1cecd2342a55aa19be635b538379c7a7a32a7bd6b65838f2e2

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