Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb843d39ec562c8c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 13:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69d2e0ecf57bb4d5276d22ac05814d5f SHA-1: e4b3af078822e491471a749408eada1ed204a564 SHA-256: eb843d39ec562c8c24cc6efaacbdfa21cf9d4c9ef8bd39d1167410f71d3d98d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://almoheetmanpower.com/public_html/userfiles/file/4980825230.pdf In PDF document text
    • http://cdkuys.handysociality.com/upload/files/larixe.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/lekabagonedo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///13788014609.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614077ad681e0---44432942341.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51bc5405a425f68ed1997bd16882d379/robekiboravokikopip.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090412220480.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/61206258497.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2fe99996---35323374376.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/48072523449.pdfIn PDF document text
    • http://unseretochter.com/images/file/68322856628.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/97383514358.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pixevivukip.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/48459564935.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904010330444020.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/101126009280.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ee9825ead47a231fe15f092d3a49b13d/77553390412.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/vaviweminekajo.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pabujivozolasiworeni.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/69434616093.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/susowasejigarig.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/86896275640.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/wekowurilatat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+6s+plus+bd+price+2021PDF 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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 18248 bytes
SHA-256: a3ba5a132479d7963e4e35e777b2fc378bc8a2e94935f3a934bd9e677eb42651
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 11004 bytes
SHA-256: 835ea1382b5bb51e414b0f4b00f7a133a0a7c346c02fea636092806ff8b12ede
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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