Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b83eb6c8088834…

MALICIOUS

PDF

69.7 KB Created: 2021-09-14 09:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0536443d969dfae1173ffd91d8721507 SHA-1: cf184b720f4da232b018db7f57e14bb5bb359d85 SHA-256: 70b83eb6c808883461044f322d4ef69330d5d5ddbea1c71f0af32c54ee021d0f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to external resources, some hosted on compromised WordPress sites. The presence of these links suggests the document is designed to lure users to potentially malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=boston+legal+script PDF link annotation
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/najirotogazigabizizigonu.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/mutelagugomabalu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ccbb69af37d479110280b4e696f8bbc1/fedorowovonesunotis.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/63298790895.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136482302a7d---pufolo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/felemazajo.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/59297700937.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/27271116204.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/wekoraneginegup.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/93268366837.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c92001cb0e---64018546561.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/vifugazavadaluleduj.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/81625816783.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/88556355631.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xixewujetugobatatitu.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/zepazu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/liwoxonufanegipijexadi.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/72062337067.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/xovemetuti.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a142143c---sibadididawo.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/welekemob.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/69376192709.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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 10600 bytes
SHA-256: 71b281d68162020c410bbf958cba511951c6dc7e09fb74755a54af9a70d59ac2
font_01_sfnt_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 15096 bytes
SHA-256: 0a6fbafa002429d2b377ee16b67d29eea739b64120168e21175f24e92d5d84ce

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