Malicious PDF — malware analysis report

Static analysis result for SHA-256 6374d2ca16508505…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 03:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af4f3b4a6d265467273f66d9ff76cbc6 SHA-1: 5aa2bd0587fab46c21812685f438ebc02f66359e SHA-256: 6374d2ca16508505b05a1248cd01e212fb0be62fbab096c4be96bb75d42b704a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are identified as link farms pointing to potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript could be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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 https://gifarlcm.com/upfiles/editor/files/xoxuzu.pdf In PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39475743776.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/susug.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/35071780920.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/rupazijujesafute.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd69bbcbf9---fiweveniwo.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/dewagezaxaf.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/gavirofurefopizinugo.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/64046506606.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/36044276141.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161313f1b4e186---morevodirubus.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/76965679516.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/luriwanonuxuvixamir.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/lemuzolitekogagor.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e90919a33e---12971281463.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/72723526966.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/diganatipuxalo.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/suxididelovuguzokafumato.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630785632/file/11264037528.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/wagiratejunox.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/34759199315.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/59164146264.pdfIn PDF document text
    • http://tzsunup.com/upload/zekemirupegitix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=record+video+from+android+screenPDF 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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 10604 bytes
SHA-256: 52bfec64a2c411dae62e07940d461a6d4c4377e34965a0a52d83f0e056e229b1
font_01_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18488 bytes
SHA-256: 4d12f0e1d72468d438c7842cbe01c5fbd668bdbad964eab99f13c2d895394056
font_02_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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