Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0e39ffca8c4c68…

MALICIOUS

PDF

83.7 KB Created: 2021-07-17 06:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8389996d51f8e6f1fac60e26cd33a9cb SHA-1: 2c62e8512d4481689a64d91ebde76f2a527939a6 SHA-256: 3a0e39ffca8c4c68a1f0135af2aabc7d5af4cf99fa936eae1d7e362f47e53152
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of embedded URLs and the overall structure suggest it's part of a phishing campaign, likely using a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b357d1e058---12008290972.pdf In PDF document text
    • https://shop-ecobati.com/medias/upload/files/dodopamirutu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8230264fe6003989df19e22b8b24d309/jekidimosomomowevu.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/duzemiv.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bjnkuc0noevkqk41mdghb68bm6/vudoxuzulomugow.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b5f0a3560---vedelupefot.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b8229p81u54p6l4j3gkdm90kl5/bilukawejek.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/252045285011.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8lpg1q5ms6v1o3g9nbtig5nr2e/fibalopuximatipunilupo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8b20394f---19514240042.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e7cf38fcc4bbb35d148def893969ffaf/41932531885.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iq6bdiq8h197flk7208eiefn5v/29753280625.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/34hglf2a3ps9mo5oj45e6nneqv/vivefurategerumuw.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4c95e458---32974956265.pdfPDF link annotation
    • http://biondiairsystem.it/userfiles/files/29929202715.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784c1536b9---64326277223.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4729cf6fd4d0b48c5e7894f3d3a71693/disivozusewir.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/xejalasopuxanigasazavu.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/kapivamibofax.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/96867117058.pdfIn PDF document text
    • http://planetamama.ru/files/file/fedagazomowapozagijifa.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/28740167994.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ad7f81acd70ed0ccdcdde3a0d6a34ed/45862045153.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5f15948826b73ae2438bcaf77356593/jamiwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=physics+worksheets+and+answersPDF 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_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 10712 bytes
SHA-256: 82f019a738ec9eb56becd76b9822cd8a778474e94e93a503e8f4bc89cd15345d
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 18160 bytes
SHA-256: dc6d22f8b59feffa9b9665d0feefae4fd20901fd780e87717dd5c5da7b4925c7
font_02_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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