Malicious PDF — malware analysis report

Static analysis result for SHA-256 2312fdaa442fcdeb…

MALICIOUS

PDF

88.0 KB Created: 2021-08-10 18:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 385708229c30340632064a937742a226 SHA-1: 51e35e3e61247f015fe6008f04f1afde78d50261 SHA-256: 2312fdaa442fcdeb0105e219563ca0bf7d1358014534df9e61ed0690e023fb8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://arcstema.com/userfiles/files/jezazameradelufokimorer.pdf In PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/163662a5e1969c905eee795e72f8c86e/biguresejefuka.pdfIn PDF document text
    • http://charivne.info/images/file/80790545650.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/26052524100.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8ce44a6075d8fb1f9dbb4cd08f83b466/28220829018.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/7418944420.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/dixevoriwokufijuravate.pdfIn PDF document text
    • http://etnorom.hu/pictures/63097820891.pdfIn PDF document text
    • http://ahchala.com/img/file/80553655798.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/78329929372.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/71df9aa0a73bdcbd71d11ed95f81d40e/desavuwugitumovusimojanok.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/9791721965.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c010b51a4db---wuwegewifenutoba.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/zebesu.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/wopanipojokaj.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/zilugal.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160905b21926e6---33276424791.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/xigikupisowimorojezadaxo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c2c89cff17901fd2e8bacc1d8ef6f6e1/silanazimumefadumopejamos.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/taxalusu.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/86316417589.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210603_193444.pdfIn PDF document text
    • http://htygroup.com/upload/files/wubomowojitegufar.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/firapupisovumazibukuwa.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/f1v7oe33a7ofcmfaev8qe6hiud/44005947243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+price+for+22+carat+goldPDF 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_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 10908 bytes
SHA-256: e9c1165d3193bf7fab4ea70c964931d8994904d474a76b99829812b9b218925d
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 17068 bytes
SHA-256: f864de69d41a716c1959d19ef57a345a4dc51c33b53c0dd0989b1467447b54eb
font_02_sfnt_off00013989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1