Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa488196c3ec0f3c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 07:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7312289a679fb1076f53887fd4d9e5d SHA-1: c409d740a71ad82072dde1cd990b647ec94ee490 SHA-256: aa488196c3ec0f3ce894150a6c2e66e28525a11df1db5121a6831fea78c2d24c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://abwvictory.com/uploads/files/lonizenabuxusibivikur.pdf In PDF document text
    • http://www.propper-droppers.nl/files/file/85376683345.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/fijomagenirasa.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/sovakosulibizakebipal.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/57459130342.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7kj11uknragicb87cidqs2kkr8/90476888773.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/26973356228.pdfIn PDF document text
    • http://slsnn.ru/content/files/62128197131.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/83468580338.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099c9fe25070---63441724360.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a52f4383d61---puremiwetitutigumik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700be5a896---4702222377.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c84478f0d---64450613835.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/kagoxamisagegizagakivuwok.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/gefokodariwigilubisosedon.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093162c0a27e---putego.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/tiravobazatebo.pdfIn PDF document text
    • https://faprosid.com/file/32411295750.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/30676031632.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/de203183d84141194d34b05d30360081/gabovibokeruwedubutaxev.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/wozefijazudokuro.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/sojilafete.pdfIn PDF document text
    • http://tele-video.ru/upload/files/81327713942.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/87612205241.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/11212379738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=from+watts+to+joulesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 17536 bytes
SHA-256: af3d3700a83502689012a202cbd953e3ef49b376c3c0d226a343b7a26c7f6343
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10368 bytes
SHA-256: 81b8a7e69c37134c74e80973e72211358fdcc8657cbc0e22ad260953a8b2d191
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1