Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a1ed62d282b148…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 03:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41dc34c01d347e4be189189ccf28ab22 SHA-1: f6ca43392eb6a3bd9df5e05ffb8bb022047a2b00 SHA-256: 48a1ed62d282b14891f3743dba6582f35c7e76d94083dd55cb60c492644305ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering second-stage payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5221d12028---zuwanep.pdf In PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/31422390084.pdfIn PDF document text
    • https://businesslife.com/content/files/71324516529.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161047921315a1---vapenogegogoxofuwef.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/savedegalufabakamatokapol.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7e3d8f1f438e01ddc57ea8e9296b277f/gobidaret.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/senulowegaribas.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lapidawizulopuzepejefa.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c8818bdc371c3bf443e684ad9e42a8b2/sezejenotogem.pdfIn PDF document text
    • https://coevent.ru/upload/files/28173625097.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/22885678938.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0aa6a7f4bd9593be64f5ab1230ca736/disukuwu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9be61f116b7f68239d2e7e5a01968bde/70602529498.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/latisujefilirezagin.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/32551693324.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9ab47cab8c3377456384101da9d89188/99645251813.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/pedevu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a9f9e54786e30d0e1c5653eac6435018/xuximopebosuxibikadupu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/i6u0uen5a7cavv8nedf5vm489s/lubupe.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/18434049320.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/gesubirorexolizoxufej.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c50f51af683---kezurupuxat.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/177df0b18e03b9918ea3e12c843fffce/wumokize.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/3243222542.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/vemitapifiwajimug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+famished+road+themes+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_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16768 bytes
SHA-256: a8b68fd30d96a9467f94cec88ccb0206dbb7fef403ea83c47f9a28fedb32e7b8
font_01_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 10576 bytes
SHA-256: 8844dba372d2b54421988888f4b857ca86127e186d074c7d399771f4a3e8c020
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1