Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f80138ad8418cfd…

MALICIOUS

PDF

74.3 KB Created: 2021-10-09 04:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a47b933ac19336c327030cd0ac876f7 SHA-1: 9b5589273e24881158d016546ee0dcbdb7ef6e9c SHA-256: 0f80138ad8418cfdea0a302193ba23913d1f31a2b24018183d3eda37aff2bcd4
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=jam+jam+meaning PDF link annotation
    • https://akrmedia.no/ckfinder/userfiles/files/9621767369.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1615d4228e5d80---34594399451.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/78932023767.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zefezofijux.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210905231401.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/75265353010.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/21dba7b37358617b33c89302e62e01d6/7172480310.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/41447044801.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/713dc145900e856367bcf85c6002123a/12660717821.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/36058188481.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/savipugodopividarokubi.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/jawulaliwanopi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/53168571174.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/36189885573.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/rujimawuwiga.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/gavijataxapa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348dac76d49---48300032105.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/65326582217.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210907012605.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/nudemoxoxoxugejipogixik.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161348ffa8dc43---1698475596.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/50842994892.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/77060441065.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_off0000c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10040 bytes
SHA-256: 99306e97c5a03f89fdefc052068bae4da2ed4c6cc85cfe8bb3d0e696d944b84a
font_02_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 17052 bytes
SHA-256: 920cda781a1e6662daa776fcbf8262e36a8556e1e8b4de52375936d8a9a95959