Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32ddc853a337f4a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 20:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8e4f577f3980e2879bee635cd5b9082 SHA-1: 21283ec7eeac29448545fa8a4bbc451f6088ba22 SHA-256: c32ddc853a337f4a72d721324ff9ae562c8af7b722dec1a4e8a82aba0d91a30c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous compromised WordPress upload storage locations and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cabini.it/userfiles/files/bawurijewovupujemufojaz.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/962sjf3phd3lj5ql64cto7ks5u/vunul.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/74f8159a3658997d49a9868986d1eba7/82165015453.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a81ce425019---37611109225.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/bakutubijutaxevisurepuva.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853a6cd58d7---pawadif.pdfIn PDF document text
    • https://digireg.ru/upload/rezeravabit.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/vafaguriwurebenumisolif.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dajemodid.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ktqk89v76vns2vcf3l8434r5q0/dakudenikuvoxutupibikul.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/45ebd3311bf38b9ae2436bc8a72973cc/66987830220.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/turuzazutebisimubetu.pdfIn PDF document text
    • https://clinicscrm.com/img/files/vafezezupen.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/41521051537.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/kojilobo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0b0d507f---19749275374.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/66234428002.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/remobivomigakawinupe.pdfIn PDF document text
    • http://manu-transport.com/documents/file/vafonero.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6b3a049c05523b5c4011886d6f3ec16e/2137147480.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0b2f25cd68d98dd3d41bfd33e6d11c05/20970899309.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e6c18d8d---25651993569.pdfIn PDF document text
    • http://bptramptour.pl/files/file/32125995843.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f378c45960ac9ed0c1beb2063335674c/81974614670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=laplace+transform+formula+proof+pdfPDF 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_off0000c085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 16804 bytes
SHA-256: ad7af093548a114457cfdac15bab448055ea44d3db2dc2718b9683ace9dad6da
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 10744 bytes
SHA-256: fc106a624a2b03476b205ff85a4a1b0ee02c23fa8e18bfb7a0a36cdff8068d37
font_02_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1