Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8365398e7b9a77c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 02:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06cf6db3ae580c73bc3b2e0b7c9a83fb SHA-1: d67f4d37b7078f18d73beb0907420825aff1f667 SHA-256: a8365398e7b9a77c8f31234451e7fd8f0af2f942e8cf4b690f2ec44362763340
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which appear to be compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archpiudue.com/userfiles/files/35263268566.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871a59d0a7c---2800680637.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/41831848263.pdfIn PDF document text
    • http://come2menorca.com/images/file/33976318083.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/85095450124.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/30371064389.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85622633689.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4136b021d---lomuximosibo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aab64ac0---fefubajuvivojito.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/lakuxuwuvufojazofetud.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/5f3ff8b7416763521ef128678b3cfc6d/funubakepebeluduguzoz.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848f5e927b7---depuxujutenewogesulenono.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/xopumomimubivaluk.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/jenosakanivisomas.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa707f2ec---nonizojurewolofugevaf.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/bazaxej.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f1abc965f57---3402567157.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/soriwizabateputu.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/68555038957.pdfIn PDF document text
    • http://veivel.com/userfiles/file/nizusilabupib.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160f9aaba954d9---sagurekobubemilegevaja.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16126db0e91dbb---4569711751.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tf3tsorjdtf07bbsnh54uiinc4/falemawetonopu.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/74122458686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=capitalist+economic+system+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 10824 bytes
SHA-256: eecd5ba6944781e564ff12a867ff8d60bcaaf68721e14bf7f4e3dd0879e9b64a
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 18820 bytes
SHA-256: d4c912617f4db5b0a28d953825e42d869ce2ae72dd726e2a5fc52ba79b2e495a
font_03_sfnt_off000146ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CE 2140 bytes
SHA-256: 104cf38ac5e21918fa95450ec333ec6a488f7d5f4aeb94d6bb0139df14cca9e3

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