Malicious PDF — malware analysis report

Static analysis result for SHA-256 885ca88bc51eb654…

MALICIOUS

PDF

89.2 KB Created: 2021-07-19 15:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1b569feb736117dcef8e0f3c7733118a SHA-1: 6a47631824d39fa05e8c6d5fae1815d02c0bc648 SHA-256: 885ca88bc51eb6542f77ffabab7dd8a369cc620dc89997d5fe6219d6fa29bae6
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and social engineering attack. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://apsco.ly/userfiles/files/85542926992.pdf In PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/vozeziloziratel.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pm8ehdvv5gpn0kgm7i73htdlka/57455700032.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed96c574f---kojageditivo.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/14524680835.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/13164982117.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rogufabizajulovet.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81e001e20---87305444392.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/lixugunadubetowabo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb253e850---31924335648.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/29c389c77580b16d73c2885e5147a309/sigetudepalena.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/11967298601.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bc7c58ce1ca7b4ad9203c7ef2096caf5/dogeganojolomituzo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2cc138ad---nozazuvidepegotalo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/53867441988.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/92959816037.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb087beba2---1347709710.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/zetamerepodowofuponizima.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/2vaknklr2bs7sgiks85qeoljoq/77507829692.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/94921590554.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/zatizovagixefapanodoxaru.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wakije.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/24368107822.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b684f63a---81276193463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=driver+not+irql+less+or+equalPDF 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_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 17836 bytes
SHA-256: 9cafc1dd967590b4b358c5c2bb788f5aa56c3f36c4102a617a3b820ec18790d0
font_01_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 10412 bytes
SHA-256: 4b8dfb5413ffed9b5ddbaa99966eca9ac8ad2c190648052dca086706047ef14f

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