Malicious PDF — malware analysis report

Static analysis result for SHA-256 c883d2e2038e6c05…

MALICIOUS

PDF

70.2 KB Created: 2021-08-10 21:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a56902bc08574b6b2aa308e8031cb96f SHA-1: b2aaaf0660e6b21faa95aa72c20488f6a8267b6d SHA-256: c883d2e2038e6c05f3602ed60b010da60e3d70f5dc9ab99337218612e1ac30ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9284

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=unfallbericht+schreiben+%C3%BCbungen+pdf PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/42246258890.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/4487240152.pdfIn PDF document text
    • https://rotitelor.com/contents//files/22772266998.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/61098873312.pdfIn PDF document text
    • http://klefmarken.se/upload/file/revituvojuvavutaxuzim.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af08e865a3e---30953670417.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/75371681545.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/4mtpna37e9ek0q2m3cmbisk46j/mibevilif.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/fugujebavesozafewun.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/98353603529.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/10a686dc20f0166e4dd325aa5447ff0b/rogojelifazajo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/92b800f45f8f8149e39dcb4f2652fab1/wobiwa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca030e77b---34999096510.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22cccaefb5---74852135340.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f4jilu5641mi5b34u19nsdmjlm/8336988652.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dbabb89a48d56f34f88e29f558daad3a/bejupekizunalifovuturon.pdfIn PDF document text
    • http://sdes.in/uploads/94369975962.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570c958a51---wamakakusofibe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fb7b5676---58376482457.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608019008c95d---96267490034.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/13270634463.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/26a10c3fc6eaca259529d515a7d885f4/96970035128.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/359cf10cf0ffe89531a084d42b5efb34/85573545089.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 11220 bytes
SHA-256: 3e3311a416e1179410633913cca0232daefdc44dcd8bee09a5147eca37a6cc53
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 17612 bytes
SHA-256: e27b40f25b6b7084ec988a5862a1fc7f51c1c256a41b1e4fb14dace0b7ae23ab

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