Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d411192b29eb8a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 20:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8e9f905177503bc3a4ba404b2f719aa SHA-1: 73db2b73934ed6998574cd4f421d587f8e3be88f SHA-256: 47d411192b29eb8a8a5c5b25419d6bcdabf573d71416d33ba702116086b61eb1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it's a link farm designed to redirect users to potentially malicious websites, disguised as a tool to remove PDF restrictions. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs and link farm structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=remove+copy+restriction+from+pdf PDF link annotation
    • http://lafenicealcamo.it/userfiles/files/vemilekexiwerubizoji.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/51518632526.pdfIn PDF document text
    • http://asqcert.net/files/files/sovevonizurititozovaburu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/birapewanolox.pdfIn PDF document text
    • https://partetesal.ir/data/file/45421269464.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902053153.pdfIn PDF document text
    • http://aven.su/userfiles/file/94543507854.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/72963059681.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/37394650902.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139919e59a1d---funogifelenejital.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/sotosaduweza.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/tovumitumefasereme.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/65171050503.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/50202312501.pdfIn PDF document text
    • http://stattus.com/assets/file/7006488632.pdfIn PDF document text
    • http://ailizia.com/userfiles/71536504777.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/weliz.pdfIn PDF document text
    • http://fabtur.ru/upload/files/lidosi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1fd28d3a7aef1e35463f94fec8e20012/fefuw.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/87722418845.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/mazexomejuvotanukize.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/rukadixemamedol.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/78896634575.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314588f0924---5656447693.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa37af15a---kikaderowewage.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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10796 bytes
SHA-256: 36ee182418d1150005530b1bab0ca8ba0537a004d2b0351ba3baf49164c164af
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 18448 bytes
SHA-256: 02b013e9e5332e836004195f8bfad6bb76619baf4e49ae8cbc4980494de6c869

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