Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb96a067a977b841…

MALICIOUS

PDF

88.0 KB Created: 2021-09-10 16:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecdd9f6be98bfd09e9ab57b35463aa5d SHA-1: bf108259b6325b66b6909dc5940f51f15a6d3a91 SHA-256: bb96a067a977b841410f21b3a11387a845e56584ae9b291e55d17e4270c99857
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or appear to be disposable hosting. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings, strongly indicates a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://sambelteri.com/contents/files/8996984349.pdf In PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/51327329221.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/6495045729.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/94251448466.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/silojodu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/49835750503.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/39030304898.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5f1aa8ed72ddb1bec7b3f833bc67fc87/14242564229.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/wisowowag.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3464d177---zuteku.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/kezujesunerosuzalufipuzim.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/70694873757.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/demarususuroruxusikifev.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/buzigosakufodugo.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/miviwepexegakej.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed605e16.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nuvilizezadorumeguxebaj.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/judonimiva.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kerizuwejozozovoxigokad.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/43657546339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vivavideo+download+windows+10PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 20052 bytes
SHA-256: d8d26bd900af198252088ef5596e03d6b0b0fd7f8bc34de4cdd41608596a15b5
font_01_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 10336 bytes
SHA-256: c45d0dc1ac8ac91ddce039d4aedfc335c801d9736a222588cff3d53f16c6e502
font_02_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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