Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1abec1b669e800b…

MALICIOUS

PDF

99.1 KB Created: 2021-08-13 22:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c73cb3b412524e865b2ff21b36f64ba SHA-1: 3d12dcd7b14484117ccaac55085f26373c2dc58f SHA-256: a1abec1b669e800bc8a6073c20aeb7d0b1ef713f4a02ba1658e4fb796e753195
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of link farms on disposable hosting. These URLs likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://allytemp.ru/uplcv?utm_term=what+are+the+5+principles+of+interior+design PDF link annotation
    • https://adtw1.com/ckfinder/userfiles/files/45105426187.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38011b4ed---72334802122.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/venokedaxerodukuwirure.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/refofu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dc959f80---17346868718.pdfIn PDF document text
    • http://hibertek.com/image/files/20210702_072100.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/xetosijonejelom.pdfIn PDF document text
    • https://jambukuning.com/contents//files/jajufagerafedurabi.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/taxonurodazimovuj.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/52118822204.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7eb0d73462f1d0a2af2d221270cd69b6/sevusubolasikomex.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/45460733748.pdfIn PDF document text
    • https://noddy.nu/images/file/14178548135.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/22604711627.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3159bcf1ac8bea23c72746c23b376126/72074561846.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06aeec6fba---35148473859.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f34a5a4f---37866331548.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/96p6mbkhotdbic7sp6ku6aelom/113084211.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ll6nf4mjtdl576t7b3jnbg75l8/60152486300.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/mezopujabedela.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/99031468415.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/pijotemuvi.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc4966f9e---voxusodufugaluniva.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc2cb0811---37551364296.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a983610e502---zavukimedazatigubusope.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/pafisokiwiduwirirozome.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vtqn1984j9lsuem9e1anumv6n1/37016825673.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/rixozevom.pdfIn PDF document text
    • 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_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 11024 bytes
SHA-256: da254dd7b620983d8a2ab375852775af4e0cd225bb40a9a4541e0ed27a75d9f3
font_01_sfnt_off00013619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 17368 bytes
SHA-256: da0d1c174f25f5b9f40a744faeb20d79b3e7b8a6f9c0840b2ac2594ff2deb7bb
font_02_sfnt_off00016358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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