Malicious PDF — malware analysis report

Static analysis result for SHA-256 320a5afc53827beb…

MALICIOUS

PDF

100.2 KB Created: 2021-09-06 05:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79ebeb4520da17056a4a27b844b30099 SHA-1: c2e609647e7bfcb6534d2b5864b95bd0e99a7da9 SHA-256: 320a5afc53827beb0e003632c462bbdcf660b08384487eeb135889a045f1e1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as https://infrive.ru/uplcv?utm_term=cisco+switch+command+reference+pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=cisco+switch+command+reference+pdf PDF link annotation
    • http://changrung.com/ckfinder/userfiles/files/batumirawodolisitubaziwel.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/gewubekikokobezejed.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/32239561503.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608167b12d6e4---bezufopimodeporuxifagisi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dd625efa4---ponefaxoresovilixon.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/74341182107.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611be1da12027---99003119151.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/fidajid.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/fagatipotizutiga.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/14889631900.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19381952378.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/zakaluje.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/99ec2977a1462ab8291b20080d160984/79679075679.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f81c64a64817c8b495b6013767ad157e/25552152630.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043769ce04---12187168436.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/wemuse.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/jizazapeti.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/zujesok.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/devegubaxawugomifuwajomas.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/da3e5b1225f9182ae498b2f5c0f86c5a/lelodixinuxaduxisaxeru.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/ragejaxogenogadazomaxobab.pdfIn PDF document text
    • http://termitecontrolservicebd.com/ck/upload/files/xadosapal.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1954748f98caf043c6e7a57290ff5f97/5411120600.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/fobubegupobusebururupeg.pdfIn PDF document text
    • 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_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 10956 bytes
SHA-256: b8e1c0671957007ce657f38bef991522f2de29cb425480156b3b852de0e7d68a
font_01_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1F 22012 bytes
SHA-256: d83aadc3a5e25cdf61ce614dfaa324d5f57acd89d4b8adba0c3713b7f924917b

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