Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb1a0175258fa51…

MALICIOUS

PDF

91.9 KB Created: 2021-07-01 00:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3746996e58ea2985268a004e5d6a147 SHA-1: 405048d9a4b49f0886ca1ca1eb7a2a02b4ad5df4 SHA-256: 7cb1a0175258fa51a404fabbbb351ae238df6717169b569acbc1655c4b7ad518
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious destinations. The presence of external URIs and link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=2500+to+3000+calorie+diet
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca42b07fcf6---33625884362.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rh1hub5t5cs2smd37d8a8k4kn6/zudunegawifujebipoxodowol.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/751a27ac89da22a5d1412a6fae28a8fb/kirorikazap.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/986640599a47ce315a7550c98a0aa8f8/sikulogadegumom.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a587d5a349969a6cc92ab557055b536b/welujetuw.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/pixabuzumutumixoxis.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b4f918367---19138670632.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/dunibeduwarifusazawoxe.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8cda63b3bf1e04439840be870dea746a/gupifemexiganipekikiva.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ermihk2fqc2fg3tje40svpu5gi/jafagefalosevekafepijob.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985841e51ed---xamonovit.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4crhn6loe4ql5i7lmtrflf2gc2/gojatabisobilulixowezoler.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/22nbpnu893lo3i9ad9355cvae2/4263291056.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ff0cf790---kenikikipav.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/655054931.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b159d869764f5150c3ce22966a0274d9/46013777812.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de570586e5---sexagawaruwuvozudaxe.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/54e37745a55c0fcff09740378ebc0499/xusulov.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/guvizoferita.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f14c774f---12366628120.pdf
    • http://chukgoobok.com/files/fckeditor/file/legagetis.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ovgaeb4i9lgl9nksd9unpshlqe/10602987368.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e73368dcb---43984430565.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f39a435d---53620635394.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86c8a4c0d0---4784907504.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb251e81c---52501131396.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_off000106b6.bin
ff59f3f5a6fbd8b53c59d9d7833656ca11b5345919a811a7e8ef39b9b39a055a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 10540 bytes
font_01_sfnt_off00011edc.bin
861620f961426822deb62532fcf30baa4075ac9d1ec3680ef10c35e44d5be6d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16788 bytes
font_02_sfnt_off00014a58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A58 16792 bytes

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