Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5701e6c33311d3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-02 03:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38324f90d59b859c9a48743a744bafb0 SHA-1: d8ad8750494e26562adb91b058facad9eeacb2c5 SHA-256: 9c5701e6c33311d358fd80ff5350444fa6b0ecfe705f8bcbbb84887a30b8c2a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/wosegibupaludibifezodit.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ac1b77e81---48055002441.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/59baa82b50271f805ee5369f9318b223/57413497890.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5089531321.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c431d501b1dd5ba5ea251957c77e30b6/99884778818.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/zajenixavesixuti.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607602e8104d4---vorep.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984cb4055a2---49066028601.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/gijarobaniwofafadebodiw.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/23249355174.pdfIn PDF document text
    • http://www.77ice.com/upload/files/44807509268.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/376bed10c08118c1efeb897cca0fd414/98197926817.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/4374821248.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6f878f70---35597546529.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/lezujeravewapalepi.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/26272703405.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/68db3db7f02092b08f510d725ba6bd86/36772860729.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/18622214923.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/fometitufazizili.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/84720615222.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210625031328158.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/46389238409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=camilla+and+parker+bowlesPDF 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_off0000b4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B3 15812 bytes
SHA-256: 04c63d99ad97dbb45f645bf33de4b73605d7f1bb80a07f01784f22ee6322ebbb
font_01_sfnt_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 10804 bytes
SHA-256: d23e5f159e679ee3542ff913a792adf35e392f3bd82d101f441c4853cfe029cc
font_02_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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