Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38c33a4e270987e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 15:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7cbf07759d8923efe6b6bddb4b423ad SHA-1: 15d9e7e6281efb8c874be729d2f7491184574cb2 SHA-256: f38c33a4e270987ebe0ca18767dfcfb08d69539b5143997874a1c4674c16d89b
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=duplicate+phone+screen+on+laptop PDF link annotation
    • http://martom24.pl/martom/userfiles/file/68427506161.pdfIn PDF document text
    • http://muszempilla.com/files/file/21186125646.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/tefozifagezawo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/498f4a59c3298f57458dbb95650d5dcf/7525858531.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wubekuzom.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/wajisejiduteze.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/51038673411.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vukogisepikevuvaf.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae02807b3---32337814895.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2056c85a0---rarewukelozil.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/16/ponabuxamemiborop.pdfIn PDF document text
    • http://dges.in/userfiles/file/jatawodorofeduwofizevote.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/1822851687.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/nabajunevelu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/xonuju.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/31405083752.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/novawoxigogusagejabepokiv.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/nijudu.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/jajolefifegibiwutanuzezas.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/wufuguninazadamolaw.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xagozonumikamifova.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/44822087814.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/zesejasuwi.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/64737004780.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_off0000b600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB600 10572 bytes
SHA-256: 12ffcea2215262cb871c444d3322584702e47d5a5dc5211bea25b596270f2dd2
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16656 bytes
SHA-256: 763d83cb58000c8232b7b89f52cdb08a680f7d4de89b27342f2a692159abb385

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