Malicious PDF — malware analysis report

Static analysis result for SHA-256 a217762dbdeb7a18…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 13:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5c3858543d32adce27f94c25e360417 SHA-1: 2f7714f62737d0f9dd0b2887fe779700a928fdac SHA-256: a217762dbdeb7a18ce18cfb87f5eb348423ecd4ca5e0ac1237fca4b9bd17df51
172 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The presence of a link farm on compromised CMS upload storage further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=ecommerce+copywriting+services PDF link annotation
    • http://ff-engineering.com/userfiles/files/72040470923.pdfIn PDF document text
    • http://ratco-hardware.com/Ups/files/dibesusazo.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/movofuwu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dcbc0d18eedd4d763cf712f95af89a6c/lemejowagidexulokixodixa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/99812119238.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/logolakebek.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/meremapokajawa.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210607021848_g5cygi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079344fc2e7a---1954076804.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/37383958830.pdfIn PDF document text
    • https://kildevangen.dk/files/dofatu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b4c2fd73fe6d1931cc5da99b6d1432e1/lozalebatu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d9edb71618e5e861c521f3cb52befcb8/93872734620.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/vusarimegagipudefiwenetid.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/85579258801.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wanorefer.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/54518441483.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1343a9052---dulanabamebejazozo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598b511be7---6118293108.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/deril.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7e5fe7fd583172e0887628d1f7f080a7/radiwajuduvovika.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/10675116738.pdfIn PDF document text
    • 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_off0000c459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC459 17092 bytes
SHA-256: 7bc5855d6eccf2cf54652e5648d1d32a915b440ab496e0ce962e5a5645be66e9
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10756 bytes
SHA-256: 4e41120bc042f3f9a683f70cec70e72c5279c9d715a74182873d70d0f2934174
font_02_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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