Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b3147a04d3f210…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 21:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50b54dcc8f94315d59595a684e691e16 SHA-1: 910a21d32ce94325f35075629db4f82c00fbbba3 SHA-256: a4b3147a04d3f2103122dcf559e7cb18dc9fac955315a09edba5781e277edf1f
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to domains associated with link farms and potentially compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to lure users to external sites. The presence of multiple unknown URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://sanphamhanquocymy.com/uploads/files/5765950552.pdf In PDF document text
    • http://studiosiriosrl.it/userfiles/files/28940847998.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ea0e39f96bdc027e3b9ef4a9d402281/zevopem.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/sepaxevi.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bebirobova.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/53879960303.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/39164608740.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/dowenirob.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/lajegaxun.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/265091546.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/lisuvinutuw.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/62241720356.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/59515976217.pdfIn PDF document text
    • http://eternaseguros.net/files/files/sepuketatuweve.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/jexagovarekezi.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/saxaxevugezekekigajuxa.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/megefitanuxesizu.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/lefog.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/69644831297.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/5133416861.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/692451479.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/torofukesomigepusesim.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/putewezujofumizuluro.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8ancdsea98ie71vopmhve86m1p/82431475379.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/18c8ff43a29a5c3ed2c3056c262c873f/doxonizekikiginelutuxil.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/56431823587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=latihan+excel+pdfPDF 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_off0000c08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08E 16852 bytes
SHA-256: 487b14e3b105ee0657acc53f4aa9a0942d7378b3e109655f3df4c6437eaf74f1
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10388 bytes
SHA-256: f6a37fa7fa717bd5e0c6f099f74cfa2abdbf81deb9b3b1e27ec28cb31e8f9e58
font_02_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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