Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef308fc36e908a1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 16:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4e32cce091664e8a7e06ba1d7e3a14a SHA-1: 1a017b18e65645271f096f9c9e95e87784c25959 SHA-256: 8ef308fc36e908a1832035676596bc4cd283bc64474b59bcacab1a95150b2554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple URLs with 'utm_term' parameters indicate an attempt to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing document or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=change+a+picture+to+pdf PDF link annotation
    • http://www.hermosabeachbungalows.com/userfiles/files/25853646819.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/welijanakitelamox.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/jojadasu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/24358835423.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a315d9bc---kodatipudotigazegagavi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130495e8511d---58704454283.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/86193773025.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/28152485924.pdfIn PDF document text
    • https://udruga-invalida.hr/files/1170631541.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/wiraxevisejudifotimede.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/bopolinororewonosum.pdfIn PDF document text
    • https://betsin.org/userfiles/files/mobumawosobavojafup.pdfIn PDF document text
    • http://zeci.nl/im/image/99289098181.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/32954644573.pdfIn PDF document text
    • http://asid.rw/userfiles/file/72685482.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wigosob.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/7107648131.pdfIn PDF document text
    • https://cncunse.com/d/files/53838077441.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/12546334782.pdfIn PDF document text
    • http://nfc.soo.jp/file/titep.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/3422976023.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/63485582951.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161308a7f77060---nazeturewitugopi.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vejeledusevi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/jatibisitepafojugututal.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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10816 bytes
SHA-256: 016fdfe4930934897c6e8a489ca557ea5b16405474caedf0288029cdcd2d4d4e
font_02_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 18072 bytes
SHA-256: 9aa7ceeeecf14cd8fa87e6fd88aa8c08139951120a90492203bc06d0f4fcc550

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