Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b8f5893fa01a16…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 01:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7008c9c0543a0d9473456401035b432f SHA-1: c5d2e81ce26649530f9d1324366a6b7f152ac349 SHA-256: b5b8f5893fa01a166864e3630e5fb332f7fc6e4c69fd98f0322e0eb099087326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely spearphishing.

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://coretry.ru/uplcv?utm_term=isaimini+2021+movie+tamil PDF link annotation
    • http://hairfibers24.com/upload/file/zomoweludigadiwevifokatum.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51149791459.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210917_16_14_15.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/89618616863.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/diwizafuvil.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/23882961107.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/10334509067.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/zulesilavemidik.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/76801032040.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/52215660772.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/75057097720.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0703f07c74b650351a2323eb4a3dfebd/paxetureb.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/busigalexeliwili.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/69a4204a121e8fabfd75c75e30673605/38970883072.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/96406180913.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/12645932283.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/54850901651.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/57303119516.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406d896f035---96088331018.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/valirofoxunagovefevefa.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/18588619741.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140e33eb1292---vurisaxuxok.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/tixudanixurip.pdfIn PDF document text
    • https://schmitz.cz/res/file/34791262172.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_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 10480 bytes
SHA-256: 0c3d3b9456bc1ee0c07113b47d6612f8f5791978c873d5b16a6753cc2f26fd02
font_02_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 18276 bytes
SHA-256: cf8202f5980d3d8a9c2de8409de7af862565d34bc3553ffc81d15b4a9ebf3aa9

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