Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4037ec267473e3…

MALICIOUS

PDF

85.8 KB Created: 2021-10-09 10:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1849ae1b67c7e60d8b2398fdfa758334 SHA-1: 31c5c84a14efaa362a8e660dadf6f24218d5f40e SHA-256: 8c4037ec267473e37437e4adfab1ac12830aaeb648008514f05d71d0240e2388
164 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 trojan threat. It functions as a link farm, containing numerous URLs that point to external sites, likely for distributing further malicious content or conducting phishing attacks. The PDF's structure and the presence of multiple external links suggest an attempt to lure users to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=2015+cet+question+paper+with+answer PDF link annotation
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/86553684537.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/80011203050.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/67687197251.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/dutadepefemofasuv.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e2ef4659b3---44991591790.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kazafoxuzujet.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/99032792750.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/45793835390.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130eed3acd01---97895398010.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/48178056705.pdfIn PDF document text
    • https://2winit.com/Files/files/13629726602.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/pusoxalupirusage.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161590e91def36---rurewinino.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/bugizabekomojazub.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/nexakugoxapuxidelawujizej.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/68123043708.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/jusurisedi.pdfIn PDF document text
    • http://mobilenmr.com/files/files/nitejixegabozubosiruxi.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/78761067785.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/vokaxokonarokewadu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/pulakodatolinal.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/cf75ac12b3ab036164b90ab5fd9df33a/livubalovumitatebovixu.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20211004233739.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/seguxifuzojujam.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/kimikupa.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/4741940959.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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 18152 bytes
SHA-256: e920bed223ce1a6b544c5c3ae3cec0a70d03a8a41229f739c5428c74cb30070e
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 11088 bytes
SHA-256: 3d67f39da3a6a36b549537db3852f6d513cd8c8f5eaf56ae82f75c22045d1392

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