Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c69d33e50c6ee04…

MALICIOUS

PDF

94.0 KB Created: 2021-07-14 00:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3edd8c6e45ec6f4557830259cb315f29 SHA-1: a00bdbdb4900a36c2f4f867ffee08b23387d91f0 SHA-256: 7c69d33e50c6ee040d147f95d39c8467ae74ec28bb6889a0242e6d169ee40b1a
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable or compromised hosting further supports this assessment.

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 https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03b1bc0db---xikipuduveraveg.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6df1a48cea---7855932753.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/g4snvfq9892ndns7cn3of1k95k/liwuk.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3b4gmu7enck4c63smus7o2sjf88o2a8k/notugisogopovov.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b548b72c---4671868484.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5458a1b6eef5a1b4d6086b371db7f739/mosoburogudexipetemezib.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/babb123a30541677f21c03091000d0d4/rogojijamokeno.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/92874262749.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/22942250707.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/76756634007.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/95d4261fa80cf571f2c79d45955dabad/18574187008.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a2cae2e3d48ec77395c0bbdeacb6b31f/xupimesuvevutapurukopa.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9882e5d5c---9317059740.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/kuvotekotexi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d882aaf1657---6095036211.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9909ec5a4---85413795125.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lelipudogezepo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/lufofizikafi.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zixodibibep.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210701_7689ED85E4A9DF26.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/24250945728.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/nazeje.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/876f2eeaf019eb7cf8a9a0703a82fff6/9382289270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=clash+of+clans+troop+combosPDF 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_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 17304 bytes
SHA-256: 9fad8da805501d41facd38633382e680d591db5ce17f26acde13c7679aea1d9d
font_01_sfnt_off0001390a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390A 10692 bytes
SHA-256: dd49e4c1e6df2c44525bb2da16e21c7621b9788148a041a6a6ee2488c4f290cd
font_02_sfnt_off00015131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1