Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4260c80ed322884…

MALICIOUS

PDF

94.2 KB Created: 2021-10-05 06:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 165f4e0110808e26dfbd114c468e4678 SHA-1: 39ad3ab84a92dc3ee4a8505beec74fc267d350ec SHA-256: f4260c80ed32288479b2f54a95ffb7b88ec279ade8c8b640e092475dab462e13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS upload directories. This indicates an attempt to obscure the final malicious destination and potentially distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • 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://burningspearmarketplace.com/js/ckfinder/userfiles/files/tijukebukelozotakozus.pdf In PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/11479966814.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/funukowab.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/gewoz.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/16513849649.pdfIn PDF document text
    • http://reopen911.info/media/file/xaseguvobudawibawoxogi.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/61565747708.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/tetabiriri.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zadajiluxakuwodefamuj.pdfIn PDF document text
    • http://strandkrabbe-hohenfelde.de/sites/default/files/files/35985564640.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4n5fo6ee5uer6i5cp2vec01tj5/86019916998.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16150954fa68b5---47824124681.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/danusenifuwojes.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/94645022710.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/lavuganawovikoxojap.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/wewix.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/61349809284.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/jexomosif.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2ddb720249b62fc6546b6085b7e2f48c/65939018003.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/69e0ocqokt9p14m87rpdovnapd/29169986571.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/molidodowitixejunoxel.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/79684023057.pdfIn PDF document text
    • http://salespate.com/userfiles/file/74783365822.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/vikotideguxigeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=beda+tiny+dan+toy+poodlePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 10284 bytes
SHA-256: 8f80d4fdaac47505674eda25232e9f426a68984e925632b20294363f0d93e391
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 16232 bytes
SHA-256: 332bcfbe1d60e71d379c8cbbf929c3b267dbca5800f78657f6d5b2b22e3587ba
font_02_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 23420 bytes
SHA-256: 6e847767c5b7041f073bc027d82aa060b5bd67689c53ab979a4c2b233d19b06e
font_03_sfnt_off0001515d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1