Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6deaf3cfa260eac…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 08:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb3a5eb3412cbdc894fdc2b4a73363b5 SHA-1: 2877f85eaedf8d28246db24b27e221213e2efaa4 SHA-256: c6deaf3cfa260eac324b5fc1c3d93b660a815c80d172f08342fae1c4e44b39be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The 'SE_CLICKFIX' heuristic suggests the document contains social engineering elements instructing the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a payload. Multiple URLs were extracted, some pointing to compromised CMS uploads, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://mariellatriolo.it/public/file/nerodasebadodexu.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/37430275847.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/ribikupabajemosirikeze.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/28104808197.pdfIn PDF document text
    • http://charontrade.hu/data/file/82167503428.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/pejekatifezoxinosa.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/77047806993.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/dutinerutowibosuwiwazabeb.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/wobajikurog.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/11855668834.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/149377847.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/54587714287.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/lukapazibugo.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///41100608985.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6200424e---befupokelo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/kuvisovetamiwixoluwa.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0227a7733b76025e6612b66a23c5aafc/69551879982.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kuxoviwubupodowexumugepig.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/guxemawaxojikimavorobusob.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/vadarigemupu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614408231a17b---vunumemumex.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/noludanifafubafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+take+a+screenshot+on+motorolaPDF 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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 17632 bytes
SHA-256: 7b59ef3e707c0c4ba41e6915e230a9ece3cd12ccbd4a198f67e6948e1ae7ca92
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10572 bytes
SHA-256: c606427cf2ef4c41e40e240d32043f70167fa9204207f49f2c28ee0e61fb636e
font_02_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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