Malicious PDF — malware analysis report

Static analysis result for SHA-256 853331677df31384…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 09:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3f7a7898bdf99d1df6b50b2f0de22a9 SHA-1: 35056f103f5ff15a81e57391d755a5ac85be9e71 SHA-256: 853331677df313848c571a637ff4fdcd06ca4605b89f7d7b999e8adc3ec25f18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable hosting and compromised CMS uploads to host these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=leer+caballo+de+troya+5+pdf PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/138c91a20ab5b327628ef5920a19d595/pogakesegozomid.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/tajujem.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/41247442510.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/xujalakino.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/10055741484.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/9005303126.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/46777174558.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db150d4bf---gazasiwuniwi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/vewiwesawijaxajed.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924873f34df---musiwejef.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/fipufewev.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/gexeferasajobol.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/30668968781.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6kfn6jjvurje83vjmh490drs86/42610758133.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210816060923.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f680eb46b3---govenatif.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/422635609ce51a089897cc3d775590fb/bamebe.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/zunuxatuwij.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/jusokuzo.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/remofewidafekusapudevisu.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fc8ccadc---tekoju.pdfIn PDF document text
    • https://fasleh.net/Files/files/zipugurubiwegobudob.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/87491882160.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609214b3ac540---lanemiwakotipewesa.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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 19764 bytes
SHA-256: 565b9f7dfd5164aa66d2b9aba707ac1aebe82623fa1964450ea71bb110fb3051
font_01_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 10596 bytes
SHA-256: 565bfad07c67317665517bca2ec91d1956efc2fda1d2337940e9c9b613ab253d
font_02_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1