Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccff8a0dc3011943…

MALICIOUS

PDF

82.3 KB Created: 2021-10-08 19:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f4749acad208e52d8fdf44a6adf42cc SHA-1: 291e5c04f653e0dc63daa5e4f97f6de6b756c3e8 SHA-256: ccff8a0dc30119432391d5eb4459a05d7ac63103c07ab133674712eb7428dfd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were extracted, the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/lunudumefepi.pdf In PDF document text
    • http://att-na.com/upload/73152007681.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/78006263076.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/56998574326.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ivtsfl1v6unum985dnibsho7m2/45838798464.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210929_175652.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rovorifutepatilol.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/0e0f88c1387d4b6fd1d1fe91b51fc2bf/40540465137.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/wimatosofaxop.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/saboj.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/goxabesido.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e436e09f4e---kejofufebijosonisajiw.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/godemogebulovu.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/37788359499.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/fokasin.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/71094625593.pdfIn PDF document text
    • http://voijin.com/userfiles/files/zuvafoletumexakijewaj.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/xajemegawilubokoxi.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/luzolinananatobo.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/sovuxivifo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/2033899333.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/lewusetasanetusiwew.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/97035759408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=spicy+vegetable+ricePDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/suvusajupelawomixun.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 10552 bytes
SHA-256: b75d4a1601640ed805a7d34e8f5135429fe3cab53aef05dc385b69531aed82e8
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 20524 bytes
SHA-256: 26dac67923f53d5c104585ea329475112a926295f6264c9212beba20a03923aa
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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