Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3e516f2f862380…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 05:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b67ebb5fdf872d2a6bc039ab1fde7ca5 SHA-1: 57be535eac14b8679dd4079bd601c594117ad90a SHA-256: ce3e516f2f8623800aac84164ab0d0dff7126d1042ac16d4d7be37938900e35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its purpose is to redirect users to other sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links to potentially compromised WordPress upload directories further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=adb+logcat+viewer PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0ef3f6a9---1041445347.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/zerubotesaninefevovamif.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/22148351474.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/sibolev.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/fatogomaxugowaba.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/nugabuguviwikarivul.pdfIn PDF document text
    • http://midel.me/userfiles/file/wajetivelurexoxotur.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/godenidotobeduxuwa.pdfIn PDF document text
    • http://adice-area.com/pictures/files/10172311238.pdfIn PDF document text
    • http://artepcb.com/upload/files/kutezagefexegutamagime.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/11054926717.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/52287826196.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/retukin.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/25819025724.pdfIn PDF document text
    • http://furniture83.com/upload/files/vapopinefotosuvapovewov.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/56043051130.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jemanutuzegifax.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/98480618313.pdfIn PDF document text
    • http://cloverdiamond.com/file/xesojebu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r5na70orbv39sspbojoto4t34a/sedixeguraxadabomiburim.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613020e8aa35e---vubaverow.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/11713007875.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nixufamonotikekafadegojoj.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/luzud.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/fatekefexijuwulep.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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 18416 bytes
SHA-256: c053761345175df19b6db2aaccc4ec11fb3058fb393ea29ccf0e627ac38e370e
font_02_sfnt_off0001368d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368D 10548 bytes
SHA-256: 649075f73241589f42db11c02f51973ea3b622f43e59ac0d8304c7cf0feb4e94