Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e7c348ac08e6ee…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 15:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 649becb765314cdfb189c4176ead5999 SHA-1: 7f49ec85c54954fb3202fbb3df98dc4a72fb229a SHA-256: 80e7c348ac08e6ee4b3e7b1e8c57d4598a7421a08d6e21a67f3b173d585b64f4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure are indicative of an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sanagustin.cl/files/79374120512.pdf In PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/nokimebaxewifexiwetamavim.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/zubokewedogow.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/7760770798.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/tufonabogomaxawebeb.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c4f13746---42498259865.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/gisanapudujejexobexi.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/kediz.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/83561453217.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/14309063172.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18552167934.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/duboxofobiputuvopig.pdfIn PDF document text
    • http://citty.org/images/uploads/file/wotozukepizadaxomolum.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/vipexativegutoteb.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f5289715ecb85d39b26d88ea8fe7c48a/fatotijijujevuxuno.pdfIn PDF document text
    • https://nomortiga.com/contents/files/18076110217.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/lepubejidig.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/wibigizebus.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/pijazibuzefibej.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/70300168762.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/raxilozemitobov.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613da07dd9e42---zajevekab.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/peramenivefidetidopo.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/bilutixererobudi.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/58711265093.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/javabifege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=magisk+app+not+installedPDF 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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 10552 bytes
SHA-256: 58041f90ba7bec1b753c1ba55b34a64a3c00c1d23863d268a0827339a06c9260
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16996 bytes
SHA-256: a960aa9ff51a99b348e62f856cdaaedbcdde9dac2f4cf031954956d9d61a4328
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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