Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d2b5c89ada8b66…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 12:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56a800a413f9fa660bf1301afe62c892 SHA-1: 079a468fc5d1a312b83815efb5a0aa06a9f9813b SHA-256: 66d2b5c89ada8b668f9ec97278fafb662380b48b3ee2904e3fa4b16362de0b63
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. Additionally, a callback phishing lure heuristic was triggered, indicating the document may prompt users to call a number for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a75d2efa63---65867257044.pdf In PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/punetara.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/95782981443.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/telelo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fe6c28a3---22801238399.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/6573133654.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9f9d6426---64594345224.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/webixoxeze.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/9984943728.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/13280679047.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2340d7cf23fa193ec63776d3fb783136/54960965514.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/54d10aca84f763d4bb7b7929d6b1252b/vogevidowevefifodi.pdfIn PDF document text
    • https://businesslife.com/content/file/vipateduxuwogelidak.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609afeb721a2a---fowodoxorujadawipusitil.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/79624824960.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0dec1cc0c70cb8bae6a54032374a4bec/50632168617.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/68911234884.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/38236271882.pdfIn PDF document text
    • http://annabarons.lv/files/files/mozobidodi.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/zidakuzewidixejafez.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/51801530483.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/35006717148.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nepuregesafuxixumiruxux.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/2398360631.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/sixilo.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/10121138117.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/jupimulofakigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=digestive+system+picture+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_off0000c19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19F 10812 bytes
SHA-256: 2a83c7d791b5643a0024dc1a53b278d91f0f275bbf6ea088a9b1f220f68eb0ad
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 15844 bytes
SHA-256: c48acaa24e41c3de28f852a5267fada6b7a1b7c76ef662c811a271043c7ff5b0
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1