Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c4c93ea35a700b…

MALICIOUS

PDF

92.0 KB Created: 2021-07-16 02:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73889b5ef39cb3b059f38e8a611c1f9d SHA-1: 9b6943888f77ff2b2963ac003105b28e0e768e2f SHA-256: 20c4c93ea35a700b6198fefeeff3e4dbc4f71364022f96a643b8452ebe466959
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and numerous external links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ddshower.com/ckfinder/userfiles/files/44636950784.pdf In PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/d9c16qel4vva4pm7pb7lhl5oeh/gixedowes.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/jogif.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2033d3b37f---lovudobizegitenama.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/97486d4e1152e489a0a0edc68e87737e/muparira.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/cc8o45ta461ofhq3lksc9d5v14/nofusifozake.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2705d8529---63905454514.pdfIn PDF document text
    • http://domplus.su/userfiles/files/furiguza.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/14694357030.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wufitekaxoxajokunuzexi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pewanalodozeriviboj.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/sowofeta.pdfIn PDF document text
    • http://leguido.net/files/74484588814.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5941189663---23830024142.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ff68dd5d5b5e8d1205d7b920cb655527/vevitif.pdfIn PDF document text
    • http://benetalent.com/upload/files/88990388790.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b231c2e8887---38473634491.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5a9ecf8cf2e4a3ba9727f0405be9a017/79576084666.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c75ec013a58b5d5b434619987ddb8750/xanobasaluvowukififab.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/konimosadogulolosigoz.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/14642903275.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/af2388b59297ccd301ce5d91e4e0f415/74793433396.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/8299132989.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608664f70b74e---budimeja.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lokl4fk0oqc693g43hfbjr9pe7/10490585289.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/jopisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=connotation+of+fatherPDF 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_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 10128 bytes
SHA-256: bad72591fdab7a136eca411021c0ee555fad19192b7693a4a78ae350b0f4d932
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 17060 bytes
SHA-256: 8b7ee4ce6f5e20f8b6aa09d03cb4340180af74ad8494c46f54d6b2f2eac2187a

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