Malicious PDF — malware analysis report

Static analysis result for SHA-256 adadce9a069c37d0…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 07:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 818b1eea12aa72bb6eb87ba57353b0da SHA-1: 260ad7a201a806e82f90c178c2b41e1ac895f443 SHA-256: adadce9a069c37d030165cbf72d8629357791a4dfddaaf5a2a2736f9a0d38c6d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, a common tactic for phishing or distributing further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=best+app+hide+application PDF link annotation
    • http://casavacanzesanvito.eu/userfiles/files/ponofelowat.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/texagemeremuxodupe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f70a870d---jonux.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/93814687327.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/wubufewamozusus.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/zakakalolej.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71906750587.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/43205312079.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/trt6h1ev8rruvnbk4668pval9nudjjb4/fidimofozetanajoxe.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/vatasopile.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/58706843342.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/11189992158.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/tivexofurudexoguxoxew.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/84487592847.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/matupilatevixavebaj.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210918045357805.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/wugakuxagilukupaw.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/galejifobitaletoruge.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/vimutatatuweruta.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/72926303004.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b8a9a7c96---vutaguga.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/36407839608.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210909091454.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16145335fef970---66442218623.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/tolitezuvudulegavaruw.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/bukojoledolovamegixila.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_off0000b812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB812 17716 bytes
SHA-256: a8c4d8c2937a6e3e8a31212c99adbb11efabd6e5bca7cc03a0274ea9d0d87a05
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 10564 bytes
SHA-256: 0ab6df93ef6461d6caf69a9bfb9b04485f763a6a2af4b657c8d4c31e600e7b25
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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