Malicious PDF — malware analysis report

Static analysis result for SHA-256 4166841eb26bb655…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 16:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3351c30766c52db7f9cf1fefaa26f7db SHA-1: 0f44db2f7785d9c12da9532b298b81da46e7d3f2 SHA-256: 4166841eb26bb6554a8b08758d3b306e60ad6ae868e235fab525b6aabd1b9ab8
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The heuristic 'SE_CALLBACK_LURE' suggests a potential phishing or tech-support scam context, further supported by the ML classifier's high confidence score and ClamAV detection. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e518b0808---37558074197.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/39n7pgslqpnrfkde1itma31imv/57358130860.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/4677353922.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/23873390709.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/87987759722.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/77847591244.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/80059113346.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/wokekijideliw.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/virinonewojidozopalux.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99878699046.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/farajojofilifegi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e1305b47---39771226534.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/72712374690.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a049ecf2143---53906916214.pdfIn PDF document text
    • http://punaide.com/userfiles/files/90007485317.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/66162294027.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1356f2b96---38358700250.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/36e6a7d9b1b301c3a8a1d437eae5afef/20458868294.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaaa72849---93594421895.pdfIn PDF document text
    • http://aimic.com/userfiles/file/miperiwapawajadekoxuzako.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/44400278656.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/88557056825.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/fiwunenutafusuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=comportamento+organizacional+facil+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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 18348 bytes
SHA-256: 4df4eb74c1b074188de138ee21a4d0954b2333e3c615e4bb25ccd4bd5ae8947e
font_02_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 10888 bytes
SHA-256: a68da5943e3f61afbbea9e6bf17075f71c95e1776cfa4c66d3fff757c8e1660e

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