Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86cfe42ad6e729a…

MALICIOUS

PDF

119.9 KB Created: 2021-07-20 17:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97dbaee0d0d762c886a95cfe49fdb502 SHA-1: 6350fd21eec81f689b33ef322b379ad96633970e SHA-256: e86cfe42ad6e729a6d9edfaf62cbffbc96df74b40ebd51404e4fcd153dcf49ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics points to the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3338396814---51383039872.pdf In PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/4005147842.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/netamazutisalisum.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/50jqmdg1jtij6nleec1eiq6bt1/57580811610.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a079775e50c99048523799ab8ca684dc/62893577300.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/komegutuxerofel.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/77470a07240ea0f3cb6064e9c64dabaa/87522677846.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aa211ebc687---97150975346.pdfIn PDF document text
    • https://ultralloy.net/upload/files/lidevufisotani.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nulusaniji.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/gubanakopupixiro.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/71866930356.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9e61acd7233f698f9b8b52b7b8eb5a35/62318139321.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c4d3973d18257551ba54c367b4e0031/gefemevaridunevozukekit.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80244439c---10987521335.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mijatuletoluros.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b64eaa753---50796891525.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/sijavagus.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a647adbd188---81704243770.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/84444404535.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kodujuxiwijexa.pdfIn PDF document text
    • http://compsult.net/userfiles/file/rilizuzuguret.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82fabffa9---majetonakesuz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877da873f36---potiwamadori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=stable+class+pretest+answersPDF 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_off0001738b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1738B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B9D 17648 bytes
SHA-256: d3403b1e1b35cbc0ca5bd0ed73e901f73046cef7e9e23e08532912c7a24c5704
font_02_sfnt_off0001ba3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA3C 10456 bytes
SHA-256: 67310574ac096ce5d73ddddda46ee0e7d36c01c0b2bc66cd33d449e2840e18b9

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