Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ff8ff7c2c73609…

MALICIOUS

PDF

90.2 KB Created: 2021-07-01 20:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9fadcb39582c59a8c7d4765f790e1827 SHA-1: 38a59f714224ae3f547a51db168e59790649069e SHA-256: f7ff8ff7c2c736095d69ce8a74feadb59c329f925ed179699a3a450c71824097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely intended to lure users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of a phishing or malware distribution campaign.

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://laborke.ru/uplcv?utm_term=wholemeal+naan+recipe PDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021051608003573499.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ff27092ea1761be9b5ff1369df1b3c79/96194282519.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d4717456ca2b3b3b4178b3271eb9d0ee/74620614134.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/joahi8gkg7hat0cfc7bl2s3ehi/51451559887.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/tiseroli.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4450808ac1---62762039026.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c078459745---57053985155.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/817d6d710c3c96149c2a362ebb78b31a/50582520915.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/wunuxemipuzozobot.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/24qr1ad5vs94n77pq5u2n245if/donatefekavedatunuvafu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079337b057ae---wuzuponomuwefuduzavomaduj.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/xezawixinitunanawe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3fd93321---59230512514.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ng77aqd90m02tu5gi37v2ahmo7/58286662336.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/80083564875.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/637a661f8a323b46102f6fedbca05942/73979774129.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/78383811517.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fd33e17d27cf9ce5cfe8ee41d21921fa/26389650274.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/24079046885.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6c649bec9bb9ccfafb8fabf9831c0bf6/malupimuwokumodem.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/54938550157.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/kukozodorubiwodevotokoza.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/50290871776.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be94b608a4d---33803593704.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eacb01108---30808038008.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8530abe7d---naxalulixekukivomunoz.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 17812 bytes
SHA-256: 01ca6231f3bc8aabe4a8d41206686b6a0531a9c78985495ccb462bc664d0ce7b
font_02_sfnt_off0001445d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445D 10368 bytes
SHA-256: 98b03f633f6d6d3345acb080c119ecc4ae375bd8d0bfd8a32d0ba805d4670d7a

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