Malicious PDF — malware analysis report

Static analysis result for SHA-256 779ea90e37833699…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 18:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43b1116a89c0ab7d8c2bb178b6e80b22 SHA-1: fd4ad9691160aba0acfb7fef14a4741f4820dbcf SHA-256: 779ea90e3783369930a2527cd42a00087ac68e8c648489066bf25927056b591a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://philabc.ru/uplcv?utm_term=how+many+kannada+alphabets+are+there
    • http://nemdanangpho.com/uploads/2021-06-17/images/files/22803759068.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d5e157f5b5---tasezurow.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609255c04a011---26171082721.pdf
    • http://shinies.ru/img/lib/file/silukutofivanunidekipawes.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e34a38bd---74826692869.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160906ab55e5f7---kozikulurogeti.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd166eb513---sorigun.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607711f34104d---85540200723.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088bdfa7aef8---zagexoxiva.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a803be1fc---69901512636.pdf
    • http://maskaevlawyer.ru/userfiles/file/49311426537.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085a816aeac3---tujilawulo.pdf
    • http://digifast.cz/userfiles/nomidusovojepeverexumiv.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160995b269d2c8---68391220039.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071597884199---96290981399.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/587ac4842893acee3d2e99e4215ce7fe/24560249179.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae1407a2d---59007035918.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04a721bb81---rosanikivukitetijavexide.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/aa8b808abc2eb5547ead685301c15f1a/sigajojefugifuk.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/128df2974f96952fb54dfdfa110c85db/nazinixoke.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/nfov6vk0g50r9tjpcgmdifdkl3/40091319800.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082451c31a0d---tiwovomo.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/665375d1c32ff3d5f8eb29f43900f9d9/40273802295.pdf
    • 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_off0000ef06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 16792 bytes
font_01_sfnt_off00010718.bin
6d06c5611945bf08e38aa19baea0657153ecc4fde7d875548bb7580a8cd7fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 19524 bytes
font_02_sfnt_off000137eb.bin
0a04fa8fdaca0a3598f99b90694d0040b57af5db9b3c048eb9ad19806cb4e0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 10988 bytes

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