Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f74ebaf6db34ff…

MALICIOUS

PDF

78.9 KB Created: 2021-07-02 12:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21bea2df74090b603e2fb4b489554664 SHA-1: 138cbeb3532728aaa421def5d44ea6717d4d81f0 SHA-256: f6f74ebaf6db34ff5df03d7bb27b786784296ac2583e497708f7e7bfe764226a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/42a656d04851bfc788c9701c4b303bd2/zewelolol.pdf In PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/gazowaxel.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609608dd50f15---golitusebigedulija.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2lerh07jvkqqh8q56jm4elkb17/73121591474.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8b098183e033b3ac5fb4cb691034a48a/sivodamu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/zutaw.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce04a67688---jugumebinevenewixofesod.pdfIn PDF document text
    • https://activepymes.com/pub/file/40344955863.pdfIn PDF document text
    • https://puntoagricoltura.it/file/xigoba.pdfIn PDF document text
    • http://chayka-svg.ru/files/11394069024.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/velafoji.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bcbd6932e---70477529302.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092168355086---26864504162.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a45ab46271---91657921762.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ce0d196c---80314480422.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/36872e1488738b5d7781dfbd4c8a4576/monezezuworegiwokikuraleb.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d578b12047---52524732494.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/voxilepaperisojipedajet.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6ed5be4d---77156831433.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/oi2m4t4c2apend4hc1j690h867/zapes.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/70014447888.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xixapasijosaxibisa.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021571254397093.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/gunepajiloveranedatoron.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/6fb89vsmnodevekdmi7a80ee4b/64336420072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=alliance+mineral+assets+share+pricePDF 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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 17556 bytes
SHA-256: 593d5f6ca437682a7593371ae4fd174753182356bbf66e6573584ee25789eb7b
font_02_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 10500 bytes
SHA-256: 18622bc3f78bc2974bcb92be652a3730da346bdf1acd63d09e4ad3cf03c1ca52