Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f05a851c92e9fe8…

MALICIOUS

PDF

74.7 KB Created: 2021-07-08 05:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26034e9665105b615b8818f5a173002d SHA-1: 0a3eef7e265ff2f2b3f599066a0ba76dbecb9f07 SHA-256: 1f05a851c92e9fe8a1b5d6759dd557f60076463ab2b81bb9570ee22b64fdc64f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads, forming a link farm. These links likely serve to redirect users to phishing sites or download further malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/54459c612b5f285057b57d9adb64e4c6/3344004069.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d9ib6tvlf380dmtco3qi8qpbs4/lumudetopoxukasi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0db42102b---jorolavufazugaxapaligitow.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2732a4ae8e---pusamopez.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/newekimibonazonumokidujul.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/79017915688.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/nujegebavaxekuwowuzike.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wamakaba.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/73600295753.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ae6fea66f9684bce107d6fc2e322afc5/teperufutopaxupiwuti.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/xuveja.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/tupane.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/34191350622.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nvbqnqr90u0qbu76jipjt47q5o/zegijisevavasanamuzus.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210604_16A6594E528301A7.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608125a8c56ea---dufaborin.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1nc40n3orfgg7snn8mvl0ra4qq/79848451041.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/dff43629991a84e76ed5c98d3f502303/fodugeliwefukeda.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/14352766366.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd770855d---84064740673.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/95435341439.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c380a010bff917ef61e26d81321231a3/66794879949.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/kisivifowokularavinate.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/98188696992.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/74dcfb2161ec90b8b61d08badcf5c34f/raferiwiniwonurafej.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e4c884672---50152201036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wave+optics+questions+with+answers+pdfPDF link annotation
    • 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_off0000c14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 11064 bytes
SHA-256: de1dc24571dcdff30a3319ab0bb2e1027659886e5a62a86faf4d8c56f3646f6c
font_02_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 15700 bytes
SHA-256: 79e5792dc4dfac7435f01ca45b1f81870da5c429e6806ac536414000c187dd6f