Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bcfa6958356dfb…

MALICIOUS

PDF

92.5 KB Created: 2021-09-19 11:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 675892a66b56bca84b303d6a3552773c SHA-1: f645859d10b505c76dc9696924360aca4e18d474 SHA-256: 49bcfa6958356dfba78c96aada8c17c866dbc9e558416d48c2b0fd69789302fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous URLs, including one pointing to a WordPress upload directory, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://krisoc.ru/uplcv?utm_term=it+chapter+2+full+movie PDF link annotation
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/kefexe.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jovarim.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/35315819121.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/9782195587.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/japoviweropoza.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///87436030142.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/guveku.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a9da313dc---63089974213.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pokewajosixoput.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/tetuzeji.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/nomezivifuvumur.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/64355854176.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/92027157442.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/wolemoge.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/malunudobopem.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/zuzafapiv.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/kilinixijizidagobupuzo.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/jebozu.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/58055072657.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/jijelijuxububemakakoj.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/98333689647.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/4661386001.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0d5fa2a38702cfe94925995b2fecc35f/99735431616.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c6cea030c5e451e4095ff51b82078657/46253696123.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/rilalodidobareruvum.pdfIn PDF document text
    • https://linardi.ru/files/file/pekatusikozemeguna.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_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 10712 bytes
SHA-256: 81f1936d372dc9eaf632d888303e92a3e93b99cc6838a4d78b5c66e6a3489992
font_02_sfnt_off0001377b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 17228 bytes
SHA-256: 1059bf0b5b5d744bb0fb489acb3047d75ca5106c46b7754b616d78884834d865