Malicious PDF — malware analysis report

Static analysis result for SHA-256 550dfd3decd45843…

MALICIOUS

PDF

82.9 KB Created: 2021-07-12 17:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa74e557364887c540b66542ae551598 SHA-1: 4bc78c81341d7b0b29b365783b17ebbd98849896 SHA-256: 550dfd3decd45843dbc15ba09fea3d97e3a2ba5195f2eb359bd10fa9838fbf54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, likely serving as a lure for users. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a121dace103---wutomabinaz.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb9c91d9f---rikabikijomeledokadonuzo.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d919c91e2---ginekobazelivalu.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbeddc464d0---20274747093.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ad47kf16r3b9jgi95qamj5vk6s/raneno.pdf
    • https://anmimar.com/royal/userfiles/file/17950453104.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d335f6ca0a---20642668364.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b287661224e---41265755340.pdf
    • http://dzstock.com/Upfiles/file/32500096888.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616a482e83---62716821369.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0099410f5---96795713008.pdf
    • http://okwmd.com/upload/fckeditor/file/zunebosidofotaputopu.pdf
    • https://bloomeng.com/uploads/43622276114.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ea643d3c873425c7483af06e3b39889a/bimiwodemegexasosuwitok.pdf
    • http://dimexautomarket.sk/ckfinder/userfiles/files/labulazanofivefijegaju.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb51d7cfe---xugefuxa.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b3239536---97149209722.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/zewul.pdf
    • http://chouchouphuquoc.net/upload/ck/files/rotedo.pdf
    • https://qpshouse.com/upload/image/file/miwifikubozemakesofizig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cover+letter+article
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ac.bin
c6c91d93e6bb4958903072a90961426e9c6604e945ce8076f3847a5b3cf08dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 16864 bytes
font_01_sfnt_off0001104d.bin
c80e809f0269460eddaa11cc5581951013335434dfe81044b38b7595706d946c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 10048 bytes
font_02_sfnt_off000126d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 16792 bytes