Malicious PDF — malware analysis report

Static analysis result for SHA-256 876a3b49bdb54b87…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 22:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7110f4e8a126200fc705e1a008b10867 SHA-1: 41766631694361c84977b4785e17cc226c8e28de SHA-256: 876a3b49bdb54b87f4b1f1af779c267669d48309d39b47f83dc6685dcc7ed12f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9f1f2cd40d0994261a067436536a92b/76565950432.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/obe8q0jloq63fhf4ug7t3gjt96/kadawirif.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bef238d64---dumutogipugodele.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/iqiggj5d72ehn4quqi4j16p84m/83876973741.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4f9566276abc5b6926db69f8047585aa/lamemedopu.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/gobekigud.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cceb7160b9---94151918840.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/58696875716.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/4052af154a1f9e14a21b2b76de05a70f/kufavewiduwa.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7c87bf24405d34116f85d2144a2c255e/54800302132.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/dorutamekula.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/neponareposetopemekiziwak.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/720ad232a045ed9562db4cc9c3738ae1/bulebuxugiwupu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/45523488480.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jr2mhdk7l9qsde6nic286hvb0f/sotuwudazilevexabor.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd5daa69---53825870430.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/85552971466.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/talepopejezoxidanodiked.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/adbbea5fa9665d6b715156eb97d57df4/145030904.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28e36e996a6d57b98d07aa50b3c44cff/jikujig.pdfIn PDF document text
    • https://megashina24.ru/files/files/vuzawe.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/sunasafokenisi.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/fefutiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=building+construction+books+in+tamil+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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16924 bytes
SHA-256: 2aec1f6ddb87c4833cb5cc41eb079b7863921ecff5f2cec6819db241cbb87a26
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 11216 bytes
SHA-256: 95b5b77c7cb37ed69bee33f085f24941381fe5fab7b5207e9d346e66dde80161

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