Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1b7c5154935ff9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-16 15:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2817e029e43b063a87831c8ba0e4146 SHA-1: d30b5c3553a93044ccec7d2a4ac0fe93a3187cc5 SHA-256: 3c1b7c5154935ff92f0b0f163dda564f0a0f697c0477286afcf5bc393e755d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attack pattern that leverages external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139990668cf8---27668745604.pdf In PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/35619756576.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/pafedipopoziw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/75099553293.pdfIn PDF document text
    • http://myphamasia.net/upload/files/zujixifimorojutonavoxi.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/26258842214.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/9355295979.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/vusuduzutewojovetosed.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/79456564576.pdfIn PDF document text
    • http://guowangcable.com/d/files/62349659256.pdfIn PDF document text
    • https://pellevah.com/upload/files/15923052863.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/mubota.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wazokesujodij.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/suzelojadakiravenarase.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rovemoja.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc85d35f8---6910302344.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/83728622641.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/68819294085.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/wifezim.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/wovowasepopufiminapigewa.pdfIn PDF document text
    • http://schokofontaene.de/idata/76237561544.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b835a23185---33865201165.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gaxumisofofevezuxapexibi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3189315c4---74271899856.pdfIn PDF document text
    • http://staropolski.net/Upload/file/wovoxulid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+hack+my+emailPDF 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_off0000ba60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 10404 bytes
SHA-256: 40c71a421350e2cfdd2fb4c18c43a366f9f7b37eb4ac6c8efcd9588444e18d34
font_02_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 16856 bytes
SHA-256: 600dc88f2534129480ba42e095c6e0d7db07f3af9ea2ea6880d9a932c075906c

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