Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed84c66a82e966f…

MALICIOUS

PDF

71.3 KB Created: 2021-08-07 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8faad53070a12c0cb7dc3ccd1c768231 SHA-1: d7a5e88e457c30f5e291c494238b645a96f294d5 SHA-256: aed84c66a82e966fdf3330a3d5b53567fa777fd4f1bba71f09dd8e2f1dd5bbde
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The file's structure suggests it is designed to exploit vulnerabilities or trick users into visiting compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=agario+troll+skins+imgur PDF link annotation
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/62aae660fe29273de2fac747e7b7ae24/vijedewalofekij.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/wagemamamusizudajip.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/luwiriwebekewako.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/nebigutumasabikadimos.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/39891172365.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/50428885780.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/21/23020551290.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/jaxazewarumemasapijive.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/pusinifetipusobobolozobu.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/65961811298.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/26078509087.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/vuwadapogesu.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/c50266e2d55b7544b687e10065a18610/dabebajibatonawuwojo.pdfIn PDF document text
    • http://salkim.com/userfiles/file/movofi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8f469eb7---89764213402.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae402132f01---belezedusikubupexewa.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aee3efd3a3767fe730dae266a5b8b8cf/wuvulariledisitidojuwivat.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe9327d76---26379519600.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b087afb78aa---22141009976.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/bfbaea7aa51bf87beab94c8b0da631ad/nolikanomizoje.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160870284eeaad---tonurakewowezurokopofa.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/rukilapog.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/wujimi.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/51385062364.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_off0000b755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 10492 bytes
SHA-256: abbc7f36b82a2f52cff30a18c8ea313745a6a75cd0618da1f1e956e018e0455d
font_01_sfnt_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 16016 bytes
SHA-256: 412c76274065f608a3e429050097c2dbaa482cc069f2e60c1996860c8b854e9f

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