Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e54d3a10b4c401…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 11:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43ae315f212b0a99d6ba43db907a8e39 SHA-1: 4a3416b7e29baaef58bdba4e9f4ef6174d0006f6 SHA-256: d8e54d3a10b4c401cbbef5dee189db6f35c50d7bddf8abe8d5b07718e74961ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, likely to host phishing content or download further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851458eb811---74705606766.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/63376cb57ce3a974904369ba63a2a00e/falum.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/67a047b023cfd46298052831dafa6d50/39211266462.pdfIn PDF document text
    • http://pileki.com/imgup/file/41421001646.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/fevufog.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7981636bfba8f71c8292d3a8cfc915cf/luxanogotijux.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q89ccnkufvvi4e2r6k2id2f29v/nalamadoxikesutumeteritix.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h5pb8a8ldf4590gtv1neckp1tr/duzule.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f1fc477d---20775745600.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/77694113687.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bf44e8e49799797a8834b0f4e7a65ab0/42941495712.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/21138488908.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088a98f0d622---58031275389.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/55927929851.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/revowabomolazorutip.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608170e871553---molufoxobuwabujolopikusiw.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210511120937278353adg1mh.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zesidubesoxabajuseb.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/82665544221.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/4508585908.pdfIn PDF document text
    • http://euro-ex.com/movijub.pdfIn PDF document text
    • https://emmaushuis.org/pages/nedokanovav.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zumixanagevalabelule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=comment+d%C3%A9terminer+l%27ensemble+de+d%C3%A9finition+d%27une+fonction+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_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 22016 bytes
SHA-256: 94b5f934814d0f5952bb7696e393dd91c886fe68b5431f533f0f808363b4b51e
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 11080 bytes
SHA-256: 645fe8841ed42ca348a09c1a1cc18c1704d4775debe89530b5a1035656cda59f
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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