Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf8484aae0bd1d6…

MALICIOUS

PDF

80.9 KB Created: 2021-07-21 00:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3372fe2cccdcac8e7d446cf8cdaab5fb SHA-1: 1d28aa4634b8449de8ab46850072c6cddbfdc480 SHA-256: 1cf8484aae0bd1d6d16667fcbc0a79480268ce5d9cc316b17afb3d248818bcf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fbcdb27fb3d2142f56cb993c2fc3dc82/70821230359.pdf In PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/bugax.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/28b9b7c10069b8eb997dcaff92f83be2/44707573058.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b0fc221c30c986046e4f1625b5e6a064/70591230424.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/84557967966.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/10985862369.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/58122175863.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/sitokazuzixedagowipo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/438fdf4c57a37609160a12ff05469beb/56597693630.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16099f40477af1---41790000341.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5297f3adb5eda072e9c057b0f2ef18c7/68165190848.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/87396169434.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/buxugedokiliwipebuxoz.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/lvrrgck6lm1vh3edkd8ru22egt/25994431688.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zunowomiv.pdfIn PDF document text
    • https://proia.bg/userfiles/file/6979914566.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4e8a3ccf063344670d6b14e418356d52/14269830898.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fitudowulalamabozaxi.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/42137887446.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb9672dae8900214383450844cb208f1/57247752063.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210522105835_bje10p.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/7723869513.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/31465c5b2a12910775c847697ebe0b7d/lemuzimilubifew.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37252a340---kovivivajexolakafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=heaven+sounds+sweeter+all+the+time+lyricsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0de5a2a19bd33d0c08b81e4ba54c6fb3/22797419825.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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 10992 bytes
SHA-256: ae8c53a6d0f2ae028ac2637f6eb5fa42aa3b0f50fedba159f9b3d48da59cface
font_01_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 17488 bytes
SHA-256: f2c358aa81ed0cfa88c52a720ade83a0f79e6694cc3c87c925dc0bae00a3eb07
font_02_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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