Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8e57f442099831…

MALICIOUS

PDF

75.9 KB Created: 2021-07-15 23:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 516a85e2840841baefd395dbd971f6c4 SHA-1: 225b27a679d7a48ade097e312304ed800ebcd493 SHA-256: 4c8e57f44209983105295880688530f1418f79877bdaafd997a4d19d195aa9c9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations. These URLs are likely used to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a link farm designed for user exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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=ferry+plantation+house PDF link annotation
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nt3qet7qsgdhak2cr94bro64r/10641745965.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078444d4cf30---66667877748.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a39cc797012---kegozuxedolenagifesogi.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/89871805886.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8675b195131e3202ac86658763fbd1a9/mumivunapuvitef.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a544f4babe---kuzaganesukefawufim.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9a24d84d80ab6d96b23fdc9a234336cd/rutosabawata.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/sisojonigaxereduk.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f177de10b2e332af6861814ec8c40abd/33188002173.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zawibaremumatesuvuwunuvab.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2a061f5b---wowubabobetajap.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/27724817815.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/98110691598.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/61132551646.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad83916fbd---51703895083.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607984dfb82ad---79099697232.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sozefazodupewikoroge.pdfIn PDF document text
    • http://abc-tel.ru/data/File/80450812164.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/52075553515.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/e4sbtm81lag5vc7chc1gp0ril3/xodubukalafawunamisaves.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833bd997325---lamudoxalowirebux.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/83896916518.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/g2fr1q9j2o8amugm2imcj5elh0/mefiloferomub.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a42cb22fb22d3207e866e3abb5451419/94274986667.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mexadosexa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7f4d04471184d85c2e177be3b9a72717/sajiranugelewaf.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/29814579945.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_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16876 bytes
SHA-256: 373a44bb3205afca81bf53828ec54a940e2a110f1f1a8f87b61064c6d2c64c0c
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10540 bytes
SHA-256: 8eaac0c569715e4ffb8b3e0849133dbc71d90a8d771a1eed43df63fd4b55ba3f