Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53d6b60898d7998…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 16:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a0c7b51567a91d8f9840cd72a39a104 SHA-1: a07900dc3fd34efa8b11fafe09c1603aaf7596ad SHA-256: a53d6b60898d7998210efc2310cf94b4e06a18c22d974e13e5c3605f084d2b0e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised CMS platforms. These elements suggest the PDF is designed to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://guides2alpes.fr/uploads/file/runaluponeteg.pdf In PDF document text
    • http://www.hgbehringer.de/img/files/files/27645747575.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/65109255110.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/299683462.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/duwunumelu.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/41549340999.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/36868728163.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16141136ebbb04---33367203746.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/difidituz.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/gatefigusojizos.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/tolama.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/66329929901.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/vuvegowip.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/15438475246.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374ae54e18e---41136991211.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/33380452090.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/molowiwawilegimi.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/laluwetajuruzalu.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/xuluwivarimuvevusijes.pdfIn PDF document text
    • https://digireg.gr/upload/totoguzijeronojor.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nipuvotorewokufozes.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613849cdd348e---99671468051.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/32583002920.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/10214031299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=watch+punky+brewster+2021+online+freePDF 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_off0000bf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF81 16800 bytes
SHA-256: 30f835fe1324389abee264c1f2a803fca70d5199ab866f4da4a5de6565d6616d
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 11396 bytes
SHA-256: f0981ef6ecc51b352a709bd14c85b54e249ff6c8d404a77e9036bdcfc36bdf11
font_02_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1