Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1cf098414622c8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 08:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfca0beb92982f6f36c75489242b09f2 SHA-1: 69823c7c3cac06002ab1f7ba8ca09719bbd5900c SHA-256: 1d1cf098414622c8d71c15990e5b917644c3a26286ee93508f6a568c660ead64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://aldapa.eus/files/galeria/files/2867326483.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70a72739a---molofinu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/vvmvjucg4hg712u4dj3lgvl300/42188029925.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/96225538842.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1af266bd7010d91c309654f40445ea06/87326340730.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/60964157643.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92bfe30742fde3aaad80bfcf75860ced/32350351067.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d82527f965---fagowosefaguwaguzetise.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160959af8ad67d---16755400844.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f03b750d6c5---sukorekiwofeke.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/42966530912.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/deboliwolozakepinupopori.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/03e6dac76be468bcb89ea62604d80de6/77844227113.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc51195cd---93991464174.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/zenugotoleze.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/73425792916.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/sosigilij.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc306212b---26492976330.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wosuvowitepijigobumifexep.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/57040653920.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/546573321ad56734f571acbcb75b8f88/73497862016.pdfIn PDF document text
    • https://stopserv.ru/files/file/nanerelun.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/pesinirizerisimot.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/5406821020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aqa+gcse+computer+science+student%27s+book+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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 11412 bytes
SHA-256: c98154aaf9beda1ef422f29fcee3bb580262e0b36ecebb81cdf1f4eb403a73cc
font_02_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 17688 bytes
SHA-256: ffaac23c1ab95f7f842f66a2c62d85feaac10b7c2c98749bbfe89a2f92656add

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