Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b648f71b54f4b0…

MALICIOUS

PDF

92.0 KB Created: 2021-07-22 21:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed9ee000f0c339d0d67e7385681f75b8 SHA-1: 1497af381ac1b67e059d6efc5e0d53c0053a1686 SHA-256: 18b648f71b54f4b03d424e7f33fd5e1626c37d940d6657225245fb012ac46493
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of a link farm and compromised CMS uploads points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://amadpich.com/userfiles/file/rixodujinevowogefuxomeru.pdf In PDF document text
    • https://2acontractor.it/images/file/gejaribukuja.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f6380d371a356bf022a1bc2338e4994c/nutexax.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/daponiwotizunusesow.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0569d04f2a5248cac81fd54bfa77fe73/zorabodikufax.pdfIn PDF document text
    • http://01host.ru/userfiles/files/40266249367.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/81609060886.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52f29de9a---5149064147.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3dcib57de6sa242tdhalr7pk37/23290682435.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/xaveselajukimonorazade.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xunulenujavixejipuroke.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/fomagibovax.pdfIn PDF document text
    • http://mobilenmr.com/files/files/zofozivitobu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc64439f44---39851062358.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/rekidupog.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6q5appjfp014fuk1g3b73m7df7/gonapufibuvuvip.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fa857b7bb---zodenebati.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/853cql3ss64679sntiate9d132/xirodixujaduzipoget.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/00ad62c9aae36e35680d8b24b34e5690/90224789453.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/72946963656.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/162a189175217dbde2a2b06f4570aff2/bikezuxibapadakolaloj.pdfIn PDF document text
    • http://cga82.com/admin/File/tunakusuxijufijozojex.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/bolafuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vehicle+undercoating+pros+and+consPDF 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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 17360 bytes
SHA-256: 64e5d2e7f1bc071e6db6df8b89f7ccfc92fc80d973a4d90ccdf7d6789f4b167a
font_02_sfnt_off00014906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14906 10864 bytes
SHA-256: 7dcad7367adad040706cff199dabba031ac0ad175909c2ac5275cf8762a79b64

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