Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f6765923ab5c41…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 09:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 971452569ab8a035e4ce736147747b4a SHA-1: ff30f98a61cb64e3f306632cc1717cf751e74593 SHA-256: d1f6765923ab5c41ae45de2de62f4286946e87a9356549f6399b6cccfd55144a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/33896910075.pdf In PDF document text
    • http://dermalab.pl/userfiles/file/92797079079.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///bazaludumiwadu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ors6dj7gg05m18s4unhgneiuhg/87603790262.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/dujabo.pdfIn PDF document text
    • https://susta.vn/userfiles/file/31813164848.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/77484447591.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5769dcbe---52469304695.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/jizanonixejogizixakonofu.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/83750774151.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/74095214309.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/52578631083.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/shvuqmjdrnhdk575rnlu71ksbf/xajoverurewida.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/j4nc6o9aghjiu6k5p4s2evkaut/33020929759.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/99104528759.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/16230408586.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/620e372fb4325b0d15d70e6705ffc6a3/57070621448.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/47489441cd8def52251b4b05012ac465/janikimatodisu.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/kunebutajarawakasus.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/30615264608.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16118b24a1a6a9---73659622656.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/paxukudazilakuripafo.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/bevizibutilanafazolaw.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3katusgb7etvluq5fr20drtja3/pefapimarinadifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=branding+and+packaging+strategies+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_off0000bacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 15500 bytes
SHA-256: 2a1788342ad188f07079b40d571352af0c6b43bd889a40a2d33f0b8073b6ddf5
font_02_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 10776 bytes
SHA-256: 37468ad769c60d26a0bdca35d902f6d4ce023f08b199f75e40f15c9e970113eb

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