Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8ead135bc3fa92…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 10:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dde6f0cacb2519b01039409768b36fe5 SHA-1: 4d36a03addb710b734c1f3c1f2a675f9fb138a7a SHA-256: 6c8ead135bc3fa92fcecd2a8107944431db8ef1d41e46fd27372b5c9f7298767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a campaign to distribute malicious content or redirect users to phishing sites. While no scripts were directly extracted, the nature of the links and the detection indicate a likely intent to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e551c4f3a7a---zigokopojolegitiwafamifu.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c692942485---kalijufovumovuten.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/10634434944.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/gulesolojugatawazukupebo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a14f83304---xigekesadasuk.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/borunuzapili.pdfIn PDF document text
    • http://jljemc.com/upload/files/35197404965.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d245c94bdd28974c4f13fc4933153378/76380063705.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/4459495910.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b1f18401---kebafukavofav.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72872834cc---21539097291.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b60216278d5---29651422848.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/bugiwufalinotiwitesofum.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/57335392810.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/529de04782c79efaa09a208617295f43/tosowunegowakolegefon.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/mimijirekezexoki.pdfIn PDF document text
    • http://philboyd.com/keditoxetovirazagofas.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/5019726344.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/85859193797.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jenelekemaderejir.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a69e0c1c8b6ea6ef9bff54817297006b/nimejijibojojuvidisep.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c3a19bc3---kureju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=that%27s+messed+up+meaningPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/50e160c7507880379b98ad09f6c4bd46/61856699844.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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 10672 bytes
SHA-256: c20a2adfa65b149e680a012a947a42823a7242444caf807b526dc9c788d87ae3
font_02_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 15212 bytes
SHA-256: c5241515c53c26884d21b38cc5f3e27f87f28dae7fc0699f809afcc6079293a6

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