Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38c17b0a791cdf1…

MALICIOUS

PDF

120.9 KB Created: 2021-07-28 08:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9611d4ee431a0d308a40fe06b9a4ffda SHA-1: d06bf6d8e0441addd74cee0fa98673daccd8f11f SHA-256: d38c17b0a791cdf1da45cce2d0b2015f951acbb44f997a21fe16128abfef7d66
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a download button lure and links pointing to compromised WordPress upload storage suggests a phishing or malware distribution scheme. The document's structure and embedded URLs are consistent with a campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609868e6d85f4---8783460368.pdf In PDF document text
    • http://agrobud.net/uploaded/file/punixuf.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/31241h7tcfjgdoj1ja2b7ta9tc/webitoronufejesiruforime.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/95342232733.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2211c10152c4361e8d5c2e3e02b3b1e7/10806969387.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fe4b1d6d---47409613297.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13243d5f98---furoj.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/texetagafif.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd43d38aaf---jexilubikigisetawi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/98e4af5e7ac2892ceed79613f76eff29/laradunokaw.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/61722757224.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/dikupibikugogofegisanex.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/23cd371b148b71aebc2c1fba6844d466/zowelutosipedepokod.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d800ddd1e91---tezikenod.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/mabuvotezanav.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/85982503660.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5204620ae---puwanaronikizaz.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/359955970.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2808108c40---jofaborikex.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/50175574126.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ek5k6jmono55fib959l3nc5270/loruwupegavaben.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/58684118641.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216181844427143.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/2466847086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+tower+korean+english+subtitlesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 23268 bytes
SHA-256: 81f59d9d31bdac5f1a55a28171aeccad45b31580030b173dba1b41071f1f01f9
font_01_sfnt_off000181da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000199f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199F1 10768 bytes
SHA-256: 13a7afc58850e59e9ea9b8f59ad8b28de519a10ab5461151186773f9b88ae7a6
font_03_sfnt_off0001b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2BC 16520 bytes
SHA-256: 8f0b95a8e821e2241a41c8a48f30577ebc30615fd3ec51887e18c1cfdf7a86a7
font_04_sfnt_off0001c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9A5 2556 bytes
SHA-256: 733242387590eead00441c01423b6b5d7e99551e95865d61770dfbf0de783c35

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