Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa2ef9ef8d8eb5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 03:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f423508b4d0c019f5bd09c6f55cf2a3a SHA-1: 3516b6ef6e7c33c981ed32daf6a13886b3cf1d3d SHA-256: 0bfa2ef9ef8d8eb575e6afdec249d99625c63b3531d6652431b1a89b4046fceb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous URLs, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hung168.tw/UserFiles/files/12822150066.pdf In PDF document text
    • http://geometracosentino.com/userfiles/files/56039235074.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/91853992909.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/40cd031982c5874632e0249c0519b957/49499556605.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/bilofasiwibikevonukabo.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pudarokujaxudofo.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/girobugegavipiwekevejimo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/rumewejudagatetamukokon.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/78011674825.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/7229377507.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319d100b3b7---6695478176.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613595075f568---nimalanuxon.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/rosusama.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/ropivujuxujowodak.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210908_114612.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135871a48a58---titalagosi.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91141484413.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161317634a947f---47088260591.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/26848896889.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/xirogawuwedep.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902112817.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/tigugawukolejotuvoko.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/degelekunasagimuk.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/tonutewu.pdfIn PDF document text
    • https://angkalaris.com/contents/files/13407470370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=zip+code+moa+pasayPDF 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_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 10404 bytes
SHA-256: 19c0891eba3e34b3115f15915b0f504628362dc6532c01045e2d35ea21a7aa35
font_02_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 17980 bytes
SHA-256: 04596e45f27ca63ee7d144b668283e3d16c5b6e63cbcca68b0aba2601d35a4fd

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