Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a79be24b5690a14…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 21:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8778ada32dec7f864b4886a63eb5abd4 SHA-1: bd668a203ab79644ce15bec64d4ac600b5ef5422 SHA-256: 6a79be24b5690a1429c69df8ae136b16af61a4d56a995703840f2d8921cab267
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised CMS upload storage. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tischlerei-schlusche.de/sites/default/files/file/sibaruzuzukodux.pdf In PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/48541803975.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/45290977309.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/gugexozatozaba.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/6017578713.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/vepowuno.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/23584307486.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f2928de126413052863c0691410c0039/21453687005.pdfIn PDF document text
    • http://web5gstore.com/Files/files/72409396445.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/21964872807.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161356c3b0bcf9---xajawum.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/43703481177.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/15419304405.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/40994589201.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/tasozizi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/54050810642.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/lojezes.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/57290132758.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/71461796856.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149100aa93c1---lanavofonidifikuf.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/polesev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mortal+kombat+apk+offlinePDF 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_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 19752 bytes
SHA-256: b41796d26ceaa83d7c399bbba2166b36bc95cfc53eba1d8523f7ba34dc33e478
font_01_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 10576 bytes
SHA-256: f523cbfba62519589e6f743cb01edfe929bbf01c083b64bae402f0c7d46f3c38

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