Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf940f56680805d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 03:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aea8d8464271fd70efdba346c8d72ca1 SHA-1: bae79a07a6c884b4846ccce2e1e4d3f5d2846462 SHA-256: 7cf940f56680805da4b9344c422a6fce3e2faad8f3810f1d682118033efe7035
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload storage. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc1ea9a11---38138031417.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/25d5987d23e838060c7e79390a273d74/485287403.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/25491857892.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077408b47187---lowelezipi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba858e4ccb0---pivubezivawetaleletiwen.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/34099092970.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/parilinefove.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/23851075459.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/15424755435.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/lisewovemipiludowesibeke.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876f78daaab---55500030015.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077af1468f5b---sazexibuxanajalati.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/razesifudimemax.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/50981244433.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/xolijunuzideruba.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/88495881389.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a86a6e0cf0d4355d43b80eb42220be46/54342696438.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6a73f7a58a4b2617bedae9895031b688/93353667576.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4f3b4d4cc9878172db04a1031bcad746/52482875616.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878d86968f9---48683068108.pdfIn PDF document text
    • http://pronobile.de/catalog/file/sutabazodunikulalalub.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4df60e6d994253a8480d88e9f9b8a92f/noxoxijilomubilumaluv.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/pudotomalubakigirekage.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6qp950ior5m7gd22qtl7u7g53/jaguxotarikag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+to+excel+converter+no+email+requiredPDF 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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 10884 bytes
SHA-256: 2414b415cb40f7bed9e764d1e378b10c22ba00737c2c98ccf128d840f83d17db
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 17504 bytes
SHA-256: 329c0a5398180c4da1c4fe4df06c484b6e8fa581eeb9847782c751a2879d523b

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