Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dff1304d29d7ac…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 12:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac7ab38a9b78136f27f4a4adac7ed250 SHA-1: 1af4d57b77409a1f42c59c532133360897cd23ca SHA-256: c7dff1304d29d7acafce3cd54da080072325e71d23b15b2d2ca5378018c47668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests the PDF is designed to lure users to malicious or compromised websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jsushibrea.com/uploads/files/filomamovodavoxavoke.pdf In PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/58006074309.pdfIn PDF document text
    • http://evola.it/userfiles/files/mumatakajokavugafixe.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ko67ntkgp5poaocqpjn85p5nru/14027932284.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/gowujugotumusazu.pdfIn PDF document text
    • http://koutingchina.com/upload/files/tuwovarefixag.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3030145b---laxak.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/tiwixubebawugevefelanojef.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/81cafc1c972db473a5a3fa3e58324073/77620984773.pdfIn PDF document text
    • http://519pf.com/userfiles/files/luwetofesojerufogamovugi.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/duxakileguwowegefin.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/sifowiwuxubadux.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/34cd6ecb4a6f603a50901ce557e76022/62081968275.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210921084656.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/nefoku.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/dijudisovezurugarabi.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/dusezifenamugixaliwawexe.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/katotufufezoreluxotav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494b737e65d---fuduvutoburovamaxupiv.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0003f3771---82147445371.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/36614215472.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/2694349108.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/38732182476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=offline+gaming+appsPDF 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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 10408 bytes
SHA-256: 0727b1d18fbc43dcd77a0fec8a42424370dd562cb6a17b47802a2b5823809684
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 18248 bytes
SHA-256: 51f32435b39239def8da537ac445e1538ddd1e1660077f896bf50d6f3824de66
font_02_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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