Malicious PDF — malware analysis report

Static analysis result for SHA-256 a990ef8ef4516ce6…

MALICIOUS

PDF

128.5 KB Created: 2021-06-28 11:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a9bebdd6bc024e3845d67164d2530476 SHA-1: fffb5c9d68bbbde3ebac6360c7150d149705be19 SHA-256: a990ef8ef4516ce6b6315595cebf1e9d01a43d109ddb004e0656272e18af6ffe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or phishing sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c05b079257---52469064919.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/20987226506.pdfIn PDF document text
    • https://combrooncom.com/contents//files/32904328002.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd13f6415b---15319302192.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789d294c452---xilis.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/fefemoluvaxuvawog.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/a3e25562b82c128c5501c33e2f525aa0/ravovenamadopar.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/e7cc49ba5d0a4b77b51d68a271c12cfd/55102383349.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0842b312---liwupumoxig.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2f94cbf44d70c6142984aab633ce2c3f/rajabapegis.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c62d67834---31574677370.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/98211193251.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ac280046---75062257705.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/587bb2fad5bc5401ef6dbd4f741c0c3f/76724191671.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a1dad653---97952494490.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/35969712820.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/92462811fa9ad30c949bd12fe6b956cc/kupoxowutam.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebec454b81---tunivuwajugir.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7cbccc77d1c2ede41a9fb7a41e3a10b7/28683739416.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878cd3a7b66---zerunebifipodofexed.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087241282e31---nutetupodopovinilavigoro.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/79156273243.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/fevoxaxoloxogefekevo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6539290bb5a9076f31a1e615c567cb11/mameregojamesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=2011+g37+coupePDF 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_off000182ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182AD 18944 bytes
SHA-256: 8a98f14743d2e71c7b21a3dcf065732e09b281164ccfa02d80f3678c08b6da00
font_01_sfnt_off0001b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52B 10296 bytes
SHA-256: 86f09131db2127b75615603ec661cccf857bc0502e97b822a85af5eaaf0e05cc
font_02_sfnt_off0001cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4A8 3676 bytes
SHA-256: c458fec528dbb54516ccc97135b1c8c862e91814c92d220ffd5ef1668e8598fc

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