Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f25edf594920458…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 06:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92521fc1ab48dab6b8925c5a3ff7b693 SHA-1: d37ddbe2172529f7360fa2078af16c17840e93be SHA-256: 4f25edf5949204581e27ba264e459ce9e5f8ec380cc7805f1b3b4d869db2203a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/77dec0e33e2117b449a75d420063c893/tetenapajujifuditunus.pdf In PDF document text
    • https://preciseenergygroup.com/media/donuzanonomupamag.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/fisolanedilabugexozerudiz.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/29407263850.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/jexefuj.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/pejifo.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/91072153398.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/89162381426.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/94366883884.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/60086081233.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20728648442.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161494f94cc846---29855613741.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/11457919639.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/lekijalokalobom.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/68846757999.pdfIn PDF document text
    • https://www.znackakvality.info/files/36619863895.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/xobilubiz.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/71okfcasudahcka83p7j2l7gfr/61064149389.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/bonivuvad.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/voxojawuxowalowafur.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161376dbad0382---sakesomako.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/wirafomegetajudo.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26945777173.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3696b2d7e534b636378399ba50c1f111/dizipifasosegagaxefajatel.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/55049561784.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/sawosimizenofewevevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sdk+manager+accept+licensePDF 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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 10904 bytes
SHA-256: fcb66a879de2457b253de1ecf845fee35142edb42e0140738b24c7b6c0c17601
font_01_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 18580 bytes
SHA-256: fa0cd8d448dcb99b255ca6b7a0623475746a079e9265ebd5f5b724017822a7fc