Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc8065872ae841a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 18:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cecbf9d289feded891fd956c38a6d09 SHA-1: ede3765ebe4a8c31bf023ee4564a357a7a7c4be3 SHA-256: 2dc8065872ae841ab8aca55caf6fb3c8c2eb972a4d9773ec224969ddd781f5f0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous URLs pointing to other PDF files hosted on various websites, many of which appear to be compromised. The primary purpose seems to be directing users to potentially malicious content through a series of redirects and unknown PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.wiz-fac.com/uploadImg/file/visezimez.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/19aa75b9c02b0af3804bff470540fbf6/36005339923.pdfIn PDF document text
    • https://biocoils.com/img/file/12076221314.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/31397912905.pdfIn PDF document text
    • http://drironcat.com/images/file/70193625828.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/19268529593.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/80286584606.pdfIn PDF document text
    • https://profm.hu/files/file/61001858953.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/22472125342.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/pativorolizanubu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613658e41441a---negeta.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/juxirabatatuwuvakezu.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/31411093248.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixufokebowepagez.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210913_2A3EB3453A05789B.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/mizisazamekewilapavo.pdfIn PDF document text
    • https://masukpt2.com/contents/files/29695859446.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/fomutagojofeduborixur.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/mozofujezow.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/577346757.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109091048027329.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0c0a56571985ac5fbb79deb17823fd48/jugiz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a1d3ee0e---kebobapikibekuli.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a37ee5a8c---sojofipolezu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f11121a9b---59826357627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=items+that+begin+with+lPDF 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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 18388 bytes
SHA-256: 85cf4777b2e60a6140755ad42001828770b8d96f958eeb8e633fdffc225399ec
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 10512 bytes
SHA-256: 493d80fcca1abb7ee33e4408257437008b8bb7dd012b80f8c4a6bc94c553f300
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1