Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2403abc1acdcdc…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 23:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2de2f2a56676f39f23b262ef033d0607 SHA-1: 53e492d5b0320832b5ebdcc1ae5c2ec5e42051e7 SHA-256: 5d2403abc1acdcdc94544d14624d0fc58af189ca4b2cb3bf007e233e58da646e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The primary goal is likely to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://postelezmasivu-liberec.cz/ckfinder/userfiles/files/pebodulimedukosuxuzavev.pdf In PDF document text
    • http://odontoflash.eu/userfiles/files/farujotefodaluk.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/vojupumevosopew.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/701f70e5e7c743c99dc96dbb53096781/buvekogusulisavutaxawif.pdfIn PDF document text
    • http://kunbot.com/upload/files/vabonedevisimo.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/redotub.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/8712560497.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7159d9a9f647d6d5c4445ca831d242cd/79830626110.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zifisupuzoz.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/38754425072.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pezim.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/64247836914.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/mimixasa.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bukuged.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/38038208313.pdfIn PDF document text
    • http://citty.org/images/uploads/file/99282256615.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/wotagavepagekeretogofo.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/51511467305.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/53099153694.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0frq87kfjdfcr0lv7390p3h4po/lubitokomed.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/bowemudikekinirumatutal.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/vefazi.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jinopadegujagadiwewemanil.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lowekisirorebigogegel.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/58400214800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+2.5+one+uiPDF 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_off0000be23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE23 10168 bytes
SHA-256: 8044fd54e3370ca144eac0ac93936e03fd0ff7b2ab075a230c25a621683c5efd
font_01_sfnt_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 20104 bytes
SHA-256: a0c7f62b039d10c0dc073f0ffdb9f123723db596238166a6d4cf65338085405d
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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