Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efc835f041a6a84…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 20:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fb100f9dcf596179a1809da6693d27f8 SHA-1: ee3f8a0a6cc3162207d3b2a6e28a7c48852c8be1 SHA-256: 0efc835f041a6a843966f5bfe078af9a673a5d1dc1ab60b284866e4bef72ffdf
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. Heuristics suggest these links are hosted on compromised CMS uploads and disposable domains, increasing the risk of phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=1+acre+in+ropani PDF link annotation
    • http://rollfactorytogo.com/uploads/files/45055470531.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17b01950a---beparos.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/80375774453.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794149b63df---zuvusufuxejoxabotoxorejiv.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7abffdd8cad3d691dd1551ef09d1d4ff/miwajuzexo.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/bogizaxu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9223c3515e---rolujava.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/piwavowuwufawafonupe.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zorigojapegetijaw.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kilifukamupajegamitu.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/bubowuzuxebogokada.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04b0e0edd---52170025655.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4299e8dc---xigurepekisexafelavemi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/biponipimapize.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/nopopabiwuvo.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/mevotuw.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b115ad8a9---jesudi.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/36322387029.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6f5777a993874c07bc975da79de8901d/93526825141.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/32745110220.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/milumusizosorobenelida.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/581cce5eec175c75aef99fb1717e01bb/24797765137.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/osgsnfurdfgpgesn6kvl36n0h7/1403226597.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4b0899d873607aca96fd671d7550e416/zoreted.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6c715b56---84083136231.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_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 17088 bytes
SHA-256: 242d6b336b3ddca002cf8b0ddcaa75b563c5112ab6a1489dbd312d254f5ffa33
font_01_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 10008 bytes
SHA-256: e46e735be97902e407274fc005c4b7d8a7e2a6908c2d4d026e78d74e2b9f28cc
font_02_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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