Malicious PDF — malware analysis report

Static analysis result for SHA-256 7815ce6b856c2516…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 02:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 513c63af503f08eb286ef86ef1b9fdb4 SHA-1: a081b726a83e23eb669e5214e968b555bb950a1a SHA-256: 7815ce6b856c2516e1b2feae77af591763a30cf8bde8a61a6073949e7c732a47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. These links likely serve as a lure to phishing sites or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=the+road+back+to+you+pdf+free PDF link annotation
    • http://lighthouse-connection.at/myPix/file/4721573927.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/wefegidi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/47736460038.pdfIn PDF document text
    • http://chromavials.com/d/files/tatovis.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/92838617536.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec04887081---jigumuzonoritowexilir.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/88690344967.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2995546869.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/23887721939.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/wamexaremupekujufima.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/68433400266.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/kedisorinegalepudisafu.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/49874829776.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902175040_548161179.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/49789440417.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/aecf1176813e34bbf297cd626e2f8484/tesekigetojavidapedunufib.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/88543719665.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6df83097---72291465507.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vuguwezilijereburimik.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/fotadabuzefifame.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613527209d81e---42310074084.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/namemupuvedulifake.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370d1035751---jixofoxulozenaxozusa.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/29551128530.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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 18560 bytes
SHA-256: 6c832456af986ccdb8b402c9166ec13613be1ae667522141173c7e338916fd94
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 10716 bytes
SHA-256: 5a1d64b91c25754acf172ae97b4859ff7df1fc62dc46df557ed9727ad89e5ad6