Malicious PDF — malware analysis report

Static analysis result for SHA-256 6790840eecac95ae…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 09:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1d47174be06fbaae8a84268195480ef SHA-1: 5612c4920171c40f1ea6451254561897df52c027 SHA-256: 6790840eecac95aec127fbfba59d1e9ff804758bf4d17b57feee9f889c1e9598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://infrive.ru/uplcv?utm_term=bearish+in+stock+market+means PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae917042954---94261193146.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f7558610efbc82778e697fbbfc95b124/mofewawomazuxik.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/31676304654.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/kanejonunixuduboxoduwu.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/xopizogesavegupid.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/60585564299.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/i5qokanfudgvia7dhudhck866o/nitepobixoxizimig.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ee376bebaa88c87fc5809a641179462e/6998560057.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a7e2cea72e08e4eaa8a9726963cffdb7/rimixekifoku.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f852f38080---52022731072.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/faxebowefepavozu.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/mewefafu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/fixatokuramozexabitapo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0d8a57bc---63544822092.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9adb8715---47231506805.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160886f592c32e---dakekuwexemavoga.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xupuzegon.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/536fc57f5b35b8d1839670767729bf75/zuwefi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbfa22f8c---kikaroguzotabazeniwomegow.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fc60982cb---rokapupuxidirifavigoku.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9467666dbe5a6e2a92ac6ec03482b02e/29779457851.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ff8b7fc86abbc466c4e8cae6466b14f8/77108258923.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/27onp5bstk5uoc6itjquf5nu6c/67787933986.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e541708daf---55824332527.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/evvjh112hu2sdpmqdpqajghl40/nozigolavanujiraf.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab5a7a14c---57874155930.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_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 17608 bytes
SHA-256: 69a27e4357001e0354387497f650af1eea8121dd05be380270607352f9d905d8
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 10592 bytes
SHA-256: 8c73c97b2e1a6702e47c7844d16aa1d0ee611c48a76d4cac98a0fd5bb2ae9b53
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1