Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ec141e39be340e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 00:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36ac5217b16abfa53311597c20723697 SHA-1: 48445401b568730d5157277428a62ce618a5ccf5 SHA-256: e3ec141e39be340e2badd9c13ddc1859393d1817cc8834133e8ea18acd0f2053
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://krisoc.ru/uplcv?utm_term=mt+nebo+state+park PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd0661f2a---danelawe.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/7191760278.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uvfcb3hpbua3j43os8lrerbiso/gudofefiwarosunem.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f660c3993b7---lopuxelalilakeneba.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/dexaxodimigejid.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/mixikexuk.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/19677987733.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d2c0d41c---73711290743.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fc7qrjn8mcgv5d4dg7upbho851/8231592931.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/vitivabamisexitas.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/21133415516.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e789adb1c766312ab6ead6a145d8bb20/wozifoleguvuvejagevubuji.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/78247315735.pdfIn PDF document text
    • https://people11people.gr/uploads/File/fovitupimadaburaxijumuj.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/31hkim31j8c3s9l0spli8t3brh/70903565740.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7f847252---42934381079.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wegudalowid.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106cee4a491a---92445220199.pdfIn PDF document text
    • http://zerosquareonline.com/file/sopaxirupisibore.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f24f68a2db57928f6f22465f4a16f76a/58411683198.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c44adc06---soxenulixirelunajuwum.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/boziwiravozimawugu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070120101493.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/vilurotumi.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/72644195430.pdfIn PDF document text
    • http://viorina-deko.com/images/file/fifaviloren.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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16840 bytes
SHA-256: 119ddde871f25b1ef18df556bccdcbe10720f775562cbe78a8f1d4d2adbf49cc
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 10332 bytes
SHA-256: 5525432e91dce05d712052fa58876118504fa8ee0843e6da44c45d52160ab829
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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