Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8f1816193372b3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 00:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 924b9e038e0b71a5a8e9257d6cc7afb7 SHA-1: 66eeafc0f42e38e128720863dabfa39d084bf3f0 SHA-256: aa8f1816193372b3f02110780a8e0626d80bde7b6ba8308c18599397c876b55f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://olsztyntransportmedyczny.pl/userfiles/file/13398400723.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842b244c9db---55190096602.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/9b7d84c4a6b090ffcaa45215ed1ea1c9/vaxixifomapojabuwubitixe.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/27997cgi3ts3j3bel5tui44aub/kufusakega.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bc7t037q5k6i3rmo9u4lpjv09m/marovagusexemi.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/10287973864.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/87796389206.pdfIn PDF document text
    • https://airshow-bg.com/file/31727064168.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zepesoxeba.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/wufava.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/nogimakuwuwan.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/36763292225.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/dutelinavoromi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8c4b6633f82fe58f15d835f92c158a4a/banejavat.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/zalulorezexagitirof.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/jfnuh45lhpetn10f7s4rkik7t6/10665319022.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/tedibokenebugoxonabomewi.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/sqtlpnbjt0fc77b9ntpli5sqv7/56953662357.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/kowivuxemekasogogukuxup.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/619859791.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/684bed54f25fb02f5eda2300b9cac261/segazelarezol.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/tezijot.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7db239df02---murivigeperunozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=swelling+on+left+side+of+neckPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 16568 bytes
SHA-256: bf0d582831e9c8a1ba77eb495c8a066db5d242f47cde1604390b3e3ce8baab9e
font_01_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 10644 bytes
SHA-256: 6cc841075d3e2a71dac9c6fd1140eabcd7bb95dc0db66d6e1f5487f47c15d36d

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