Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ce1ec155b92834…

MALICIOUS

PDF

70.5 KB Created: 2021-09-08 10:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb736fde1eae984cc17780f63d4c1ff0 SHA-1: a7d4f00e8c1e7d1c0260a033dbd822b08de72f49 SHA-256: 35ce1ec155b92834e235b55844c6cf1eb7f71008adf6c6cef3da0d272407c1a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/10785e7001a742eaeb99c1fe3f90aa54/4410762970.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b79ec9a2f4c1937b121e1d192f50205d/pubadare.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/kaviwegenawo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/521beb02ee994a2e5dc2a91ec26a67e0/82909453815.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd3045129---68788966372.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/nuzomuvavupefudiwazoxig.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mt09dgl0fe3v2lhjakdvp2htg3/kenozejidupijezob.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/witodonuw.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/63155741423.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/9187476370.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/21342384805.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3da96881f05766ea9374391d9ac73dcb/tuvovobaduxulok.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/84634179a7519db0b63510646776b643/muzawunasusanopifiv.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/23634377726.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/jabonowebekuwudotasobel.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/96247182681.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/69836301013.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3262d3cc---zeniwagatowutifef.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/zosexifiserebo.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/kosejagekogataner.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/bagufalajovajisibajenep.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/66859348981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=uu+kpk+2019+pdf+hukumonlinePDF 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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 15516 bytes
SHA-256: ffbe8f198f5433dd3adcaedf396090d2bdd5db2e192c1b0c87f399ce6bcf7249
font_01_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 10896 bytes
SHA-256: a647010be4ec5f514f9e24c5a9eba7bdc7dd831925b8ed96c4bd98cd9c587ccf

Open this report in the interactive analyzer, or submit your own file for analysis.