Malicious PDF — malware analysis report

Static analysis result for SHA-256 828de5e39f5115f3…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 01:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cead2b6eae6e2fdf6925f99151b348e SHA-1: 26af21d288e62fcd2d2797b6365b21aa37d67bf5 SHA-256: 828de5e39f5115f352bb48cd15d2a9d3b7774481452dca73fe73ea1eed440178
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inijariku.com/ckfinder/userfiles/files/tuxaraxevifusu.pdf In PDF document text
    • http://meubelenindex.nl/images/uploads/zibudusadifofejizirezade.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/67620934232.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/titafizuvizogil.pdfIn PDF document text
    • http://renknh.com/ckupload/files/37633631146.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/sizulopodojerokiwusumivi.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///26638321672.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/92118232468.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/merubexujowuvamuwin.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc343c7bdc---88855551937.pdfIn PDF document text
    • http://standardamulet.com/files/files/1189864644.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc828a5eb6---vegusudejona.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/23815690410.pdfIn PDF document text
    • http://melabo.com/upload/files/42302294036.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/94430856737.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/wekomosujixonekiredu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/34394833754.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164532b9fe---53864076406.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/36821978026.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/tejiruneda.pdfIn PDF document text
    • https://spyboarcams.com/files/parisunerizam.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/pavepufezunikejelarimozam.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/77793953419.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/246443054.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/9926359375.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/paxukuzewisenozaxugexori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+scan+on+iphone+qr+codePDF 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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 16960 bytes
SHA-256: b6add976f417eebf0fe9dc6fe90bcb76e12680d1bf33307cafa5ba0b015b4eba
font_01_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 10788 bytes
SHA-256: 20a7975eeab3a08912dc5ee7127285748db7dca8826ae92e2c7fa1e9e2b5797e
font_02_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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