Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a3295aab3da11b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 14:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4657e76b341d21135a2438afa6a4f82 SHA-1: 8786d66e16c70a8b272b70a73088a40049f86b2b SHA-256: 74a3295aab3da11bbc325dc7ce910cee58f0057048a7fc92c20e7beeed7b99cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. No scripts were extracted, but the structure strongly suggests a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3f6e4a3a---93195828478.pdf In PDF document text
    • http://beloezoloto.ru/userfiles/file/86650770829.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/54228492144.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7e286655bd253b14b72c2872c69bfebf/80666008605.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8211a0d8306df6ae603d0528ea7cd30c/87161841720.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/zazemalejubiri.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/zerizododuxivowab.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/gudawef.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0062e4bfc---rivisax.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/jizidurudevozipifoxakuse.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/56277791551.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fb348b451f6c6e38e6d363f644390246/juduwazabigim.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xomixetu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608528e415af9---dakedareto.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/82248758577.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zikifegedinu.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/mafavadinunukame.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b8436eef7fd2a64dbc9668483c168a35/bevevefizelitalasupi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c37b8ec27c1---bunuwij.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/46930e5c4a464893fb41cc398e7c12c9/25433179735.pdfIn PDF document text
    • https://agros.net/uploads/file/diluzajofawoj.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/87740895422.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/81404038202.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/bemap.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tavijirafaxidomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=continental+drift+theory+activity+worksheetPDF 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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 10964 bytes
SHA-256: 1de599baa1ab42e82183fa1768cfb8047be609dca1282ad2c2fd6bf5d6d3cb3c
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 17908 bytes
SHA-256: 51db0de3285041336148dafa374415cd95477a85ee63826e128255e7d36e8d0a
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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