Malicious PDF — malware analysis report

Static analysis result for SHA-256 726e3a3d618cbc75…

MALICIOUS

PDF

83.9 KB Created: 2021-10-18 05:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 64292cd7f61bfef755a448a4b3efe5ac SHA-1: f1c37128a98a78aee018ac938a252fe38d845663 SHA-256: 726e3a3d618cbc7509175742aeed62e211c84aca342d773fa89132d988e64833
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple link farm heuristics and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ligogo.com/fckupload/file/75510016105.pdf In PDF document text
    • https://haciendaloscipreses.cl/upload/file/10315287038.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/74198728064.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/288cfeff462754ea1795031fcf3b4ebd/50000148444.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/giputokuzuvawenisisejope.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/7253915294.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616c8c223b9f4---vesuzete.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7315a659492f10bcb8f9293aa4fef2b5/84169337196.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/joxekigepegugo.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/pumixaxutiwedixagese.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/11576451885.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff52ee302---94092353854.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/givawosuzidamuxunim.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210912075531685806.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/95536195907.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616acc21931ac---97998985692.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904101117.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35a40ac4b---43906219823.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/10387856318.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d649190f75---givikofidiwujadunure.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/61662052683.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1d06d850---nitunilenexemaxubeti.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/87101447615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=happy+birthday+message+to+a+godmotherPDF 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_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10932 bytes
SHA-256: 4c1250b9c5ea6515ec0d159c2c9c7838a61bba0329470e6507f49974bf194f8e
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 18972 bytes
SHA-256: f4d9d5c6be0f73ce33efedafb66349e0805a1a0264ff346ed8747812113d9c3a

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