Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa1e15a004c7a26…

MALICIOUS

PDF

80.4 KB Created: 2021-07-06 02:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f0dd80f46e9436047a02edb39a7403e8 SHA-1: 610f7aa9a50774c990726302cf440d2cdbd0747e SHA-256: 6aa1e15a004c7a269f5d3ed39a3ac89f15a034e02b740c4a58e66aaa793ae600
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or are part of a link farm designed to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://elearning-chemistry.ro/userfiles/file/fupagugogu.pdf In PDF document text
    • http://applexin.com/ttpsea/files/file/donupebitasifiwag.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511190915.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/85937564403.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/21863517271.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9a2ed255a7ec59b62c0b47ee03039257/25029067418.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9976gnrg67f8q18j9nal4fkqd1/vuxugawobibubezopodas.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb926ac456---84564959512.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752c9c1354d---woxapomat.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/53447391921.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077693d852a8---metefefadozose.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d13e21779d45cb8a371667cdbfd72436/87058121063.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/goromuzuguliw.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/28244901252.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be412737fd8---ferosimagudenaniwugi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cfefcd5ba5501bfccf47e596f3a303fe/42024014091.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/85671761080.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/545be7279f0473917e3dfb7d41883a6a/fumajedivisid.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/59909420162.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/47273214926.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774bf249d41---64337753533.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608561f2aa2c0---64088360000.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qppa99aivetd3uh748mauhq4sa/rexanasuxizogukaveral.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=alien+periodic+table+questions+answer+keyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54959683d---5975248087.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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 11164 bytes
SHA-256: 07328ab5ce1a6c49a13944a2d344f2d5e0d520378819010feeb32ed94a62e626
font_02_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 17684 bytes
SHA-256: 60cd942560fdef95f855f57f2d3a612afd339e5ceff4f645acba03c4d092ef81

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