Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce14a991c58dd201…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 14:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 160aca7c870ae76e432bff9290a75fbc SHA-1: 6d69bc08380d32dc93d03938dbaa346ab99b62f2 SHA-256: ce14a991c58dd2011fa6259415acaba23e42e8f28895dd91d4e1a1d39c9d732a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the links suggest the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=android+sms+from+pc PDF link annotation
    • http://veewood.com/file_media/file_image/file/wetotezedubudo.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/54044266717.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/850082958.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/23474515989.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/wixamamunasenapuvunogaf.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/gonawuragusikesopuxiwiti.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/madimuwusijakoforakapo.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/rikedolekukuzudi.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/bupobakex.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144578d210a4---82165946576.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/71664936493.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93dd17405---busejelev.pdfIn PDF document text
    • https://service-panev.com/userfiles/91771830532.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/24284407282.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304379c4d4a---91914863290.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/10147436501.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/62332615530.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/xewuwozonipepaxokasagepa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613828d6183a7---lodexinakilifagitugewimi.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/tamogiw.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/dilumasudapolalimujemag.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/74209409129.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/digojoravapofebe.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/10663138528.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_off0000b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 18288 bytes
SHA-256: d65f8d9da23b91ac91fc6dfdd27901061f027df533d4d5884ac0aaa72895c83d
font_01_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 10324 bytes
SHA-256: 864dfd09edc25e67a4e798e55edfa2ff4aaa512bcdaf86985a55bd077bb25992
font_02_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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