Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb8f31494ceefc2…

MALICIOUS

PDF

141.7 KB Created: 2021-09-04 16:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d24efe38b048d137664921ae0c39612 SHA-1: e1d896479a69e5bc7d350bb19856eb5cabda9ed6 SHA-256: bcb8f31494ceefc2ea1a5b7792241024d9ae32bfce7e9f4cad68dbda776e0649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious or phishing content. The presence of external URIs and link farm characteristics indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://catamma.ru/uplcv?utm_term=facilities+planning+tompkins+4th+edition+pdf+free PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add39d80aca---zagoxugodubuwamejaveras.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bcf944a5---12933446267.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/11003525312.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/60165219412.pdfIn PDF document text
    • https://faceless.me/userfiles/files/68978741363.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3d75e8b6b3da2565626cd49acd3f38b2/wesifip.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789336d515---63100552708.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/15022762318.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/mebawowixelatirisov.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/17217574525.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vupulipimuxavinin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4740109eaee011990b8390ad8c753990/70982323026.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/pivirupixipogatij.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/setimegulepusib.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/38141690519.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8003209c31a670de39d257c79d89fd3/58090144884.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/jeduluwolifemap.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b71cb1648---97964664375.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/50209089784.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/ralovotu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a70eec6e98c74459c8308f6c406b0095/libukujobupelotulujoxoj.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/67291651676.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_off0001c042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C042 11212 bytes
SHA-256: 6429e44abe69fdbdb054d12d34788a041d869656516013f047b8c2d5e28340ae
font_01_sfnt_off0001da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA1B 20484 bytes
SHA-256: 877a3d4472d639031fa3ab165cf1cc3e317a9a2b93e9196e9d8b5460cf905caf
font_02_sfnt_off00021032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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