Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb8ae15a2f3e3e5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 10:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7ca6db7b59fdb2dd66980cfaafd015a SHA-1: 10e94fb9e3b8db26d8656df9369f483d7e6642ab SHA-256: ebb8ae15a2f3e3e5dde2690bde63bb5387d1f3a3e74f2e187e9f0e0d4fb35a3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting the primary purpose is to redirect users to malicious content. The file's structure and the presence of external links indicate it is likely used in phishing campaigns or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=viber+messenger+apk PDF link annotation
    • https://guanlai.tw/uploads/files/202109140605329638.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/55610747704.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59befcc7e1f3a07ea6f62d87d1126340/jorenesejigofopulariso.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/75r9b9negrkqlu28mfj8eegi26/jabawogazudadonalurezu.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/87372477277.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/36625118783.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f2e8a355---guzibuvewepugitimililim.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/61926820834.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/jugeka.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/19433773741.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/kidajutebilejujeteluzowu.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/56271321075.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/vodusak.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/3448946421.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109100935156219.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/suwosekasuzalapaniketerun.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/56006141906.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/xolodemafamo.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/mokafamavoworep.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/wadakafanarug.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/pukesolerad.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/89083729117.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/72699674154.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/63724026260.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_off0000c41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10532 bytes
SHA-256: da7654301d5f9c05e8be58d29afdddf67ee5248217cf1e9dcc1a8b2b0d96f570
font_02_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 19536 bytes
SHA-256: 1669d24d94ad42b9c93e78b8910362e3b07ad7821a2e53c629f417736851328c

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