Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8f442ec171fc26…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 02:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8f1412fe41c77450f0997234fa35d5f SHA-1: f55d8b6800c48a9d561a5281ca9c090799aac52b SHA-256: 5d8f442ec171fc264ea7335310773411afbcb17e9113f3aa210956ada6777029
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, indicates a phishing or malicious content distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saveursetsavoirs.fr/image/file/45898439833.pdf In PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/worozotoka.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/busizawosi.pdfIn PDF document text
    • http://3q1p.com/upload/file/210615181039478501zhr3nejaeg5r.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724abe339b4---28993130420.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/2733027068.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142f13e04a8---54382059064.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/52681863158.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c00c35b3872---petalavewizoxomani.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/b5652c4ea0f0b3ccae25c63fe20c8842.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/03d6210c845e0e2f6be9b14099ea4449/88054839354.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa203748057---sakibijopofigi.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/24492922485.pdfIn PDF document text
    • http://mebco.ru/images/file/xezaxifusabikajesugabifi.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/dugajijetufokirajazi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e812cc47424---62231873319.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/26412112280.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cccf345a63b---dupaladuru.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/gikoza.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/51015606014.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/toxiwebugowa.pdfIn PDF document text
    • https://digireg.cz/upload/15003213235.pdfIn PDF document text
    • https://denimder.org/resimler/files/nedizedaku.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kadotuwabekitisibi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c289a8dd03b---regezagijokikexotaluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vestax+qfo+user+manualPDF 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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 10600 bytes
SHA-256: dfeb4d1f837088227c236bec42358f403a6f22db8bedf414b9721af78f2322c4
font_02_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 22120 bytes
SHA-256: 2b49876b78779da8afddbf91019d947375db85dfbf5ae57421746009e91008b5