Malicious PDF — malware analysis report

Static analysis result for SHA-256 41890dc365be492c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 15:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d255eee27cdcc9c1d6e49a326652c906 SHA-1: e79423a9b6fea023b1e1c9bec9917c06c9e661d7 SHA-256: 41890dc365be492c86c1331509c5e7d4bf144cea546f72696bd59530949230ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links points to a tactic of leveraging potentially malicious or compromised infrastructure to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+use+scrcpy+windows+10 PDF link annotation
    • http://tiszaikaland.hu/upload/file/rikoxogosofig.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/54938968107.pdfIn PDF document text
    • https://pecsikult.hu/files/file/54495395751.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/57524988357.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/pavufoguwanoteker.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/92854506509.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/t5vav6c40htqlpkhbhagmheccg/fonovarevukejijas.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/11371162492.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/69619784242.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/dabadebugunuli.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/japavufapirununeri.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jiwes.pdfIn PDF document text
    • http://ty-int.com/files/files/pedazi.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/63092487662.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98455824940.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_C468BCAC4867F61C.pdfIn PDF document text
    • http://lj-group.cn/upload/files/36799162397.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/wibaremevomukukusuru.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/64283570225.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9ccdf0ff---31508859175.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed7dee05c---60030579215.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/xudivemimejijetawogizi.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/sosutubuku.pdfIn PDF document text
    • http://hk-keber.de/images/file/55129062264.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fed3e556c---21073115998.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/4116345361.pdfIn PDF document text
    • https://uudanbury.life/files/file/kavuzunix.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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10764 bytes
SHA-256: 04a83e62e922d606867a271cfaf40b00417392ba653ef4fda7c341ba590e8276
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 17204 bytes
SHA-256: 54291560335cc1fbf2218a131fd21828f0b876195ce0bfcf2653492a0f10a3e1

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