Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13e3bea2b472a55…

MALICIOUS

PDF

92.7 KB Created: 2021-09-19 17:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6eb109c5fe1cedbad54687569d584b9f SHA-1: 992a6457767462a0cbb5c6716d96a22a000d40d2 SHA-256: e13e3bea2b472a5587816dab60d066fa8dfda71e07edca50a48ac303a024a109
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and using SEO-related terms, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=minecraft+beta+version+mod+apk PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4kigilemqd3om8f3utjqocv363/82551744918.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fulijurovoji.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffdfed6ce---getusukusezitufamidabapar.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/dafosutasemufemojifen.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109160526372519.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/32550802923.pdfIn PDF document text
    • http://senesi-sklad.cz/userfiles/file/98561847498.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/27817653067.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/90683886948.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/77223232342.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/84090976273.pdfIn PDF document text
    • http://medi-sen.com/files/files/puguziliwemewefigomi.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zufawijefuraxumegimu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pasujezavogimerod.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6da96cb11d9aa047399b786db3a9e738/sununajezeden.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/96745508099.pdfIn PDF document text
    • http://remobudostol.pl/pliki/88253720492.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/70405880113.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/99373609193.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/23440437135.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/xexudorov.pdfIn PDF document text
    • http://asi-filter.pl/files/file/ludubuzowavegadolo.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/18967910471.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/lugexipegewa.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_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 11024 bytes
SHA-256: d55d37a0af1889e246f2b06715e61b8cee6be70a783542512254dee54c12f2ed
font_02_sfnt_off0001350e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350E 18820 bytes
SHA-256: c0866f75e15ccf22e1d782c55f5bd9c554a7870cb08fef24f39d2421ded1c2f1

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