Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa80cf6ddf7f42b…

MALICIOUS

PDF

96.9 KB Created: 2021-09-12 16:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30e94f0c40e7fe0a0984de7dda0725c1 SHA-1: 26d98432fc34af5a675faa32da7d12001faad741 SHA-256: cfa80cf6ddf7f42b96edefa6176448717c943c292fcce18d5f8556ccbbaa1664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=how+to+build+android+project+in+eclipse PDF link annotation
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/76249444872.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/23ee7acc5831410778efb1d7a8815fdf.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/53088570249.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/26483296245.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/86863275342.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rikilovuvitoxutex.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab653ef82d---peturesamafuzirudet.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/12649191891.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303afd44444---91994200981.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/48946452140.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/28003752537.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d72dfdab---4105023702.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/48760743485.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/wenasevimipisexa.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/35642690868.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d98473d8e77eb6f18deb957c9d2f1d41/4680971838.pdfIn PDF document text
    • https://anjingliar.com/contents/files/79065295343.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/87226722958.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fubireti.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/29808236344.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/faworatofisukoro.pdfIn PDF document text
    • https://rjpexport.com/files/sanokesora.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_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 17648 bytes
SHA-256: 3da526a931fb3c7f8105984140a7aaa04bb5797f3296dc4fa4288222c3efc1d5
font_01_sfnt_off00014496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14496 10952 bytes
SHA-256: 7a123ed93f4cd413eee1572ea639d759c7baf5c066aeef088ec7cacd94259cbe
font_02_sfnt_off00015dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1