Malicious PDF — malware analysis report

Static analysis result for SHA-256 909d43dc532b1e0f…

MALICIOUS

PDF

68.7 KB Created: 2021-09-06 22:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4544761d6651d6469c25b4feae238e9a SHA-1: c368a21c315cedf96fdc1138a7cb28b6bc4a285d SHA-256: 909d43dc532b1e0f57bd349053a5f44ccf1de07db43b9a28ec78a2db0760ca04
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack vector is likely spearphishing attachment, with the PDF serving as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://foodsaver.nl/app/webroot/files/userfiles/files/dijugateteweragisenes.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/acdb223a161d09bc2912c8f8c9441afc/jisasojogigep.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c498747f---fagepakowo.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed5a5b595---94241342933.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ab8c92bd---21251638890.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ec99e6ca0a7c7fea48b53edc58542efb/47663436264.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/64528628732.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361793aab76---sujafofuditufa.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/54390289438.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947921a138d---12351947033.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/97924730418.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8e06b8e573ea59e0a77d14345b52fc97/36421032801.pdfIn PDF document text
    • http://deltools.com/userfiles/file/81027734013.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210824_051455.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/zuvipebowinoxabilofobom.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/78317121171.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/a0c14b19573a4bd4c10887eae9dc2d49/16448459737.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202108200622194026.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/pexifa.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/aisjcg2po1fpdso6h078ruoud6/sezenubumezopok.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/1699793822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hydroxyapatite+properties+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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 10548 bytes
SHA-256: f450ff447a6ccbd1e731cd235e9954591ccfd180cf63522bfe2fec7441b936af
font_02_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 14552 bytes
SHA-256: a3ec3a6ee657a930a9d08bc82833602f5d85ba73f31bf840e3747f56b836556f

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