Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb21e1ae837a0ff…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 22:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a490a65e87d892250f025fe253eeae10 SHA-1: b41ed72744b4c54fa0273295d2c0426b1ef33b56 SHA-256: 5fb21e1ae837a0ffcf6f0b10268a725785b481312562f75199914c5c4ff1ac6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. The presence of multiple unknown PDF links suggests an attempt to manipulate search engine rankings or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2ea0023678c195d7903c430188616905/18530230343.pdf In PDF document text
    • https://fajanav.com/aym_image/files/61297147508.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/lekurixa.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/vinumiw.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/19085921041.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/sikeroxonadexosoba.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/ziseluruz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/85111304642.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2979fe874f3cf15e5a030e73d4c011a8/judewofebaxenoba.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/b4u4rs6jd201k64fh3ev583e31/61924347997.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df35e77fa01---juzitule.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5080f27af7be3c2c4b85e3c943aa0cce/mexatogazativutomamidam.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/10556854380.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a4ed7991b---beruninogalamijeju.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/98c5832e4f6651d4bc473028ef99b49d/kidavukifutubaneranoxazu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/11414518766.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab7579a83---64192782759.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/kozanigarifubisazaposipob.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/4633467913.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/zutonoz.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609943aec5120---bafemuv.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0283885b3---lelafat.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/aebe41f4a1265d7377210dafe58a7c2e/guranijezumeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=geopolymer+concrete+technology+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_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 17072 bytes
SHA-256: 9b6ac626abfdff40dd1a0388e5f494e975e93eeeae2863b070f74e92951735e5
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10796 bytes
SHA-256: acce7a2aa5846077f639bd2b54e9d204aa777377ba7fbccaa4874c41e3c8efbb