Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8f03f71236355f…

MALICIOUS

PDF

144.1 KB Created: 2021-07-03 00:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 136c88a0a826efeb1190bcf8f22f98c3 SHA-1: 7fd687c800eb606b1ef503c9b1ad61c8ede29cfd SHA-256: dc8f03f71236355fe74ce4b0eca725df5f6af68b6851cf52d42cb22de2d0a030
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Mark-of-the-Web Bypass

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_SECURITY_BYPASS' suggests the document instructs the user to disable security software, a common tactic in phishing and malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a link farm designed to host malicious documents, likely for a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.evisiontiendaonline.com/ckfinder/userfiles/files/fuzenijozapifi.pdf In PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dcjlkfd4da8p3a7ltm4hjq9fc/5940255410.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/dutipepajigugiwobixi.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/31461682017.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bebdde530---wuvorobidepudolamogud.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ba2a2cca46d11ff56cef46218aa8ed3/dawaraw.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/10rg6piajtc73lmc1fn20slg2k/82702546958.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/temibejitoges.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31fe6842d---ranonufinanewi.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/27682363940.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/jqtsjjbtihm7pbgu5ism3clkjp/99755631754.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/5ad0a139206967dee2432dfe313f04a8/35666900753.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096538471152---70472945427.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/29246320426.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/kufofemato.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/lcsbbbjjrai2jrusc4n75h49f6/patopojusugoxobotudefuvat.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/funikuzamiwaxusefa.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d35845f5c1d04745680f102e32c1a36c/69634920260.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1d81pg69re79o2qitk1qanobd7/wesisakuf.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/89d57d1697337a484d53725c409163d2/492086024.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/bepege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ping+reply+from+different+ip+destination+host+unreachablePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4045f885842bc8722b55746eaa441582/42434346863.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 11424 bytes
SHA-256: b960ed4283b976e494c4eda8cf409f1bd92f34b8091090dd40560838bb02fd3f
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 91396 bytes
SHA-256: 41e2b5e0bcdd1543d4e7a367ccf8d8a14c9b65303773540825ff13abf058aa9f
font_03_sfnt_off000206b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206B9 16772 bytes
SHA-256: 918da2c2f06ab95ef492365a93f1ccf23d6cad8795910f0fcf4b3c0378e586a8

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