Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a480500fa4cc9…

MALICIOUS

PDF

72.2 KB Created: 2021-07-16 17:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3703e054e8c80191305f90a593464bab SHA-1: f3797b68e72748f6a18bedc52d92f7d997d7dc8b SHA-256: 7a8a480500fa4cc91124e503b77b3dc68aa1481e8196120909ac4de87e4c351c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content, likely intended to deceive users or manipulate search engine rankings. No scripts were extracted, but the presence of multiple external links suggests a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/paxivasukisatupu.pdf
    • http://nail-free.com/ckfinder/userfiles/files/74636880609.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5a969f8c---bepenonekikagidosadas.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce78b7c9661---jifoxukakisosebe.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/dosadakikaj.pdf
    • https://aimhc.com/userfiles/file/74113892048.pdf
    • http://placc.info/up_image/vakiberugatorij.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/95bf353fe74d2bb6bada785ff555c020/27622404985.pdf
    • https://stratasphere.online/userfiles/file/85485132733.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/28770181661.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d0c722908e115e822375341bcd1598b0/ridis.pdf
    • http://banghetretunhien.com/media/ftp/file/94964475239.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981d74d3aa9---67280978629.pdf
    • http://afslab.asia/upload/files/71515429850.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3baaf7a10d---gerefodizotegiwomul.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1915272df84b24e1b853062202ce12d4/bitukilapafa.pdf
    • https://northcoteplaza.com/userfiles/file/solibaso.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607167d5a4c76---juganokixujojikojadowiv.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84af695a48---81496355248.pdf
    • http://beveragesgs.com/userfiles/file/31134636225.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/dibatewowirofepujagugug.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a9e98f3542202cc9cc581bd3f5fe13a/55877216106.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa6b8cca0caea335a3c5a27dbd165a5d/61194946800.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd106069a7---wojubivetojerana.pdf
    • http://colorfulmedia.de/fotki/fotki/file/8700788418.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hardness+of+water+by+complexometric+titration
    • 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_off0000baab.bin
034b15350d3ecd17b45244302cfd0d79d0e743f4709b199759b83a3dcedfd459
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAB 15296 bytes
font_01_sfnt_off0000e124.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 16792 bytes
font_02_sfnt_off0000f93b.bin
c6d44addf1a03ae18afe9a1a3a01967e46c21e47f46ba6ae28bbc9fc49914c32
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 11212 bytes