Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52db6b279488778…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 08:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c540063221dc3cea0a16979914eca6db SHA-1: 6069e41336d16b5dc647120f755ad24d1b337842 SHA-256: c52db6b27948877857dfc3267c0c7f56e10de0cdc9d91fe4ae84eb8db837ca3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics supports the classification as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ibtaker.ps/userfiles/file/dobijobopuzizizab.pdf In PDF document text
    • http://scamps.biz/userfiles/file/nasipokinizesutekovaro.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9541568fc9---tabasunokumosenom.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/481978092ffecd80fdbb0a27de299ca4/27605601369.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/c0d6a8c7817f36646c8ce42b3fc40087/falewijeda.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/7131481228.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/18152430760.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/33807925994.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/perifazajokekubelawetixub.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160785b3fc5f3d---39704731334.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/71278037150.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/supekamese.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc31a5e59a---jadelabuko.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732c4e24c10---62190202890.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b931b5d7e49---merunuveg.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/h4df6b92a0j2b9tt1lvstur6a6/83351161184.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/867604cd23cec1f3191a3537bb88404d/79961574609.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/pewoditulolabozafedo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b681ac9ea4---jineriwetufotemeko.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8eccb52bf9549d7ee5f49dd6c0d270f8/zolotilugatazofupezolow.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/26749757736.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0118f85b01---38742583214.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/91807514518.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/930b53ff3d08d298d6c5b2ad080a6319/jazirojififepura.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/zolasugebixomozebatotolot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cliff+jumping+near+mePDF 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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 17636 bytes
SHA-256: 3f5ff70da86cbdf6afd64cf2385f93c307aee340c5e993188f23b399563446bb
font_01_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 10576 bytes
SHA-256: b77bbe62ad32b845fd2efdc480ecfb35e38c2d3127d30c2fea56ad26573ffcca
font_02_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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