Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e15da3f940e05d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 08:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 902c896fe48c50c410902cfd67947034 SHA-1: 15b7648c4ad94384245e953013c2b1c1e0d495a6 SHA-256: a2e15da3f940e05d4b83faec616229cf16994fabd0c4b95d90c0b7959c4dbd49
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, specifically as a phishing or trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the final destination through redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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=my+hero+academia+s2+ep7 PDF link annotation
    • http://sangtaoad.com/uploads/userfiles/file/45919390706.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/90477849856.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/keliforasidolixuwud.pdfIn PDF document text
    • https://tpk-m.ru/files/file/biwaratirexizusiwodi.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/43243412088.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/fupamuburijewafajifu.pdfIn PDF document text
    • http://orlickachata.cz/files/files/52954461392.pdfIn PDF document text
    • https://lordoptika.hu/files/files/36434609903.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/devir.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/wolaxuxojusidukuja.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/nekomarepimo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e813b71b5---75005304022.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/76120610583.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/32574026574.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a754dae1f0---fifemu.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/37962076307.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109151111466340.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc9b96759---mikavajokafesafululif.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vewex.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/79162993674.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/daxixur.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nenakuvenedepuvakupof.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/koteworezevarofolewal.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/fujuzepinugivubekezus.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/piganasukowoxovutidu.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/sojulifal.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wibigife.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_off0000c41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41A 10808 bytes
SHA-256: f1462fed4428c0e1310e4a675da0614bdd088da33e117d7fc2ce9a05fd8dcafa
font_01_sfnt_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 18772 bytes
SHA-256: 265dc94a91991bc9e6afdfa573e5ed55903622ce56c0d433928a25d3479c1ecb
font_02_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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