Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fe4adb06a83688…

MALICIOUS

PDF

88.2 KB Created: 2021-07-19 00:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16faaa9800f6ced0b60bd2589382210c SHA-1: 28664a436bfdb949e9b2608eacd4d8a2ff0b03cc SHA-256: b5fe4adb06a836883dc1cae117b0427fb2a035a5fb1072f72240b2deb1217111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://amatnieks.com/pictures/image/rukovak.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/42331153516.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ce077d75---50232343255.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f76921ceae0108929fd0bb3f3218f94f/jedoxegigej.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4cde5705---31205178987.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4985794181---22622118566.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7b5ab6affaebec3431c3f285de93b8ae/82956068116.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607686327a944---23013151865.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f5aa6931---56977912921.pdf
    • http://stalmont.eu/userfiles/file/60595243613.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609816430abd9---11460897122.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a391a510401---dapulegibimisunifedow.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93449c5c1166a7c70744cf88d3d75807/xixinojavesebevixoba.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/123e0643a9eada37e5dfdfc69e1139e4/miwulugifigokurixiwik.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c244ef0946d---70263529270.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e30059ff1---74114552135.pdf
    • http://benhvienlaptop.biz/userfiles/file/60937162985.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/bamoxoto.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfbb18e60---liboxakikusi.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/pusafusatakelise.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72b2cf785---87067405065.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf397192f---71291202635.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900597d3701---15208516767.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cit+104+past+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef68.bin
7b3c18be74cd32a7e5e30a97e905223314129f2efd88b9cf789aaffde1185f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10952 bytes
font_01_sfnt_off000108e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 16792 bytes
font_02_sfnt_off000120f7.bin
c778c6fae2a3965d956f34d908a84cb4a3950c154e0fdcfb4ba0caa71e624e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 19168 bytes

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