Malicious PDF — malware analysis report

Static analysis result for SHA-256 0763cc1a9073a6f9…

MALICIOUS

PDF

100.2 KB Created: 2021-09-05 13:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d649a530ef7f47ad7a0404cd471a87c SHA-1: a6ef2bd89f095f439f65c947b558f908bd22ccd9 SHA-256: 0763cc1a9073a6f98be3104328bdc543163dbf6658e09db40840c378015c3828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm used for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8f48ac66856a089144c018bc95ad702/99312590598.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/24264858880.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/volowugarem.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cgcruh49mv4n2pqo5jdu684emf/75625325443.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f1f26e1472dc74e364235100993cdfee/33067106442.pdfIn PDF document text
    • https://advik.net/userfiles/file/25518235913.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210816050111258.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/wizarixo.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/54092514290.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54010417284.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/xapotopix.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/sazavufuwo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b795cc88235---doxepipem.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/64a4de49795526052692655c104554e9/65544652378.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xunakasanakofuzu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e4de375a6a888b8d6cda6fc2d0444a93/58106327138.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/xakagewoxile.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/gipusilonusiwubapaje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48eec838a7---raribigerolovitix.pdfIn PDF document text
    • http://poorclarescork.ie/images/6171246602.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/nepatozapubemofidap.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/bebupozopunuwefuwuvive.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/59417248973.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/zitofuzetiwid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dave+presidential+movie+worksheet+answer+keyPDF 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_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 11016 bytes
SHA-256: b095582c1b0a174e56540d44e4d9b9ae9350f853db68cdbe978d661dd8c98207
font_01_sfnt_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001535e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535E 17880 bytes
SHA-256: 4f17bcfaf8841c31cb807c0ee08113b2780575cc2142bbce573b7b18757fc8e0

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