Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf1d1bb54a18054…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32ddf65fd859882b20e378d1a5681020 SHA-1: 4f650f56e308a4a23ed41f03b7840a4397355daa SHA-256: ccf1d1bb54a18054f933afddaf6f982e5f1e5c6d3681cc4d023a2feefddaada3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple URLs pointing to compromised upload storage and disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/78648128206.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3057e44d---37723737291.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/41432596526.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949240c5f54---31283779872.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/jokulavefigejexitabali.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/nifigowuguwij.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607662ce626a1---17289540409.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/82729084731.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/59844904009.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6ce882e7---7334398369.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/37chi85almd5k7nq4jbm0kg8a5/funagulixopopefemo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569377a945---tufuduwedirofuwase.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/107nb8isj5ggrcbt7jj8e6p4a3/rarize.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/98713713986.pdfIn PDF document text
    • http://nscenter.cn/upload/files/33218383000.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/545c6cd1709942fc2560a4e348c73501/vavimopofix.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8854a5b03---galoxujezifugekanikovepu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16081700b8cfa8---femifokafuj.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/56759499635.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f075295e6---59655277704.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bcue971k80o4duvv04km0l9hi6/28691524756.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/zudub.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/11320153177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sap+mm+tutorial+for+beginners+pdf+free+downloadPDF 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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 17444 bytes
SHA-256: 1b302245ccae5c0771f6671c90112e3a0a068a0dcd548a94e867eaa52d1a018e
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 11244 bytes
SHA-256: 67352d14ff22749fa7f38ae32646eda1fea69838d47dd22fff05278d8104373b
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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