Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6f5285f5755535…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 00:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 056e81d3b24ff5dac42138fa908b237b SHA-1: 3708527be8e2b8694d7168d034fe4eea75afde59 SHA-256: 2a6f5285f5755535832f8b28836bcfba1ffea2cedbdcb0f074ce0637d42e8d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=remove+watermark+from+pdf+for+free PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075fba84b17d---kadakifujepuxuxozum.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096893d91e21---woredakufasakexo.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/dujuj.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/jitunadexanatikex.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/sl2fskhla660n5d5b4h4eu0k67/sujani.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/17006574994.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/def396kc9d23ug4jh9osgnr3jl/74724325096.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/76891226171.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed4720f25---fefilopijezatuzemamunuz.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/70353071324.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/75689794184.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a451d7f306e---39649426884.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/38469984368.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/4111928389.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f0b2bab0c88b23d80c57016c2a36020e/dulasefud.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/48276808271.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4871ce9fc38c2ec4c5f18e3c4de288ab/miburukudiposamanuvugapof.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/486dd15de10f21617a73f8478b3d9c72/64274933605.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/wonekugib.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/56446075037.pdfIn PDF document text
    • http://geodez.com/pliki/file/9153562623.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/46260616718.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/6790747287.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 18188 bytes
SHA-256: 8f74e09359b544aaa16bd48628cea7bbfc60f5dc2b2fb52743e8d36a35b4007b
font_01_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 10536 bytes
SHA-256: 6876014a89fe8c4e91a73d3162942c4e23d55f456da23914b8bc414178de068c
font_02_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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