Malicious PDF — malware analysis report

Static analysis result for SHA-256 d654b59683435ac8…

MALICIOUS

PDF

139.6 KB Created: 2021-09-05 21:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96f6230c208a45f9d16fb3feb556a50a SHA-1: 9c40a388e9c0e8f84f35f69c05c8a3ed18d6a023 SHA-256: d654b59683435ac82a27df560f87370afdc9f8827f6948852fb5077f21606814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous URLs pointing to other PDF files hosted on compromised websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of external URIs and the link farm structure points towards a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o9runhqpv2tt1ea7onpv1tv5so/28567254939.pdf In PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/64346136134.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9794f51a73---91026863540.pdfIn PDF document text
    • http://na3.it/misc/file/ragujufotazisa.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/67895058238.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/wowisitejifir.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/66044096074.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/akgrqqg6197mfakk5tm5shrfgh/nizukij.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/8249505598.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021081611050566.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/wivekafiwenes.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/74903393430.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/timuxozip.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j1qlvgs8jt6r3s0bs9tn0bs8r4/45182710939.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0f5d7c2d---18886105733.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/90039972684.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/be2b9a34ace5a9a28fa6c551cea78277/digufesafuvidumiwisuso.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/46234105690.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/35583615074.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/magatovevurenu.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/74377964857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=comic+books+marvel+pdfPDF link annotation
    • https://lapdonline.org/file/37138641765.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B844 21556 bytes
SHA-256: fdc2f7743ee47a13bf9a93f68cbd32b1701d87557cbea1209748ec4e455c96c1
font_01_sfnt_off0001efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000207ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207CE 10908 bytes
SHA-256: 71452e60cf52b13f709d8879da255e988fcbae0dd95d550e4f103aa718ee9210

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