Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92afbce42d993ee…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 10:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f385daef0a918655f29ab61eedadb0d1 SHA-1: 3f74971c8c59d52fa7a1d951b6e836a142abee24 SHA-256: f92afbce42d993ee1695efdd38d6b4542fe175c9abd3312c827742416e6987c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://allytemp.ru/uplcv?utm_term=7+letter+words+with+two+f%27s PDF link annotation
    • http://utuin.net/files/fckeditor/file/39083464471.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/59ae47b537273c25f6fbd7423cecbcbe/noraninogelarotek.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8f678e1cc11dc85a39e159d4fa81422c/xutivazimur.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab79e5e6da---91372404914.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f696ecde2d---6682142243.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/watakoz.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/29821278237.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9cc3b974c12b12943a8a3fb6a8101614/weleruzuvutikazagixi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5b5d2rh0uskh2he9amj51cgtj6/9183883049.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9a2121d4---43636209739.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/47ghljdn81muohugpabs7sfhp6/pulebojujiposeguxesuk.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/72379816811.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/13/file/20210513_124259_199.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8f516d625---xolujefofek.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/333s66pl3ld2tp7g6gp1tilq95/fisujarijofinezakigala.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3fuqkh40cg252jmrc93k198ij4/lovoxu.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/44431747703.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nopadogofevomeleku.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/roxedeborugomusi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160964ef449677---35012902259.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a54aaa18fb9---45975804964.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/29060840574.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/12491040219.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/simewisatonoruxipuw.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h1eg56ha83qp1c5t74d6nm83oc/48221041028.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kd86r2j4l84rhjnqt5kn865qav/24214924180.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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 17548 bytes
SHA-256: a4b5a5ec9dd5318c02d01a2ffbf16ee39abbffbcbe6e03bfa0d3be2ff78d9ca7
font_02_sfnt_off00013cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB3 10256 bytes
SHA-256: 9671ef1589e87071fe9d28eb2d90af87c99fec3b25d7cfba0023ebc4bb125ea6