Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee71be32cbbd2738…

MALICIOUS

PDF

92.4 KB Created: 2021-06-25 19:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eb298b43d3e3d89968b5d0b61600fbdc SHA-1: 2d326b096f1427308c7fd89584b2c98619c05981 SHA-256: ee71be32cbbd2738f1c342e05a0c672c77000ebdc6855476cdeec5af1f18e449
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites or disposable domains, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://lexus-custom.com/js/upload/files/25374061871.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/lofumovavaxomakazoxifok.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/981957749ecfe6aebe67a8450a4b74df/womigefes.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/13352067748.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2c1c161ae---20084535254.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ijannlqffa1j8uevf9s9ckktk3/14958580959.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fe32533b09caf66217d17509f1eb535d/59651762755.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/nomemak.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6p6shp361t16g49s1d0g73l174/nitaz.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/6005981985.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/24j5egief8taingoi7mapbhee7/28089101417.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/povurukewupuwarafaji.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/lobopopoxapajokavejus.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/wexamexiluwolitewami.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea435111---vuwetitibom.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/q2k7d5dsdcqc48n31u5inlaft7/tokijedisenuzubaduve.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed76c1a116.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b00dcaae---89489656472.pdfIn PDF document text
    • http://tano-cable.com/d/files/37513980575.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c552272bbc---tinotagezakutebagitivaf.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2147f0c92---27770958136.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607542eaeb261---vebajumalejerafaxu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/xigiritisow.pdfIn PDF document text
    • http://bjjiffy.com/upload/20271743916.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9gtfs2ntm497a020gk28gnfc82/41442472055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=meaning+of+party+favorsPDF 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
stream_002_off0000cb3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB3D 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_01_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 10660 bytes
SHA-256: 15c6048e27ac58050ecc9122abcd04fa13c624e3822a51559068f54ac18451c9
font_02_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 24276 bytes
SHA-256: 6d8b004d3412885cfba7ba6cef1274f38f7f3a513e718e8b5f699ce8d5c1348a
font_04_sfnt_off00014965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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