Malicious PDF — malware analysis report

Static analysis result for SHA-256 310cbf382e10dc9e…

MALICIOUS

PDF

77.9 KB Created: 2021-07-03 05:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 403d749512039cd8aa50585f131c8cfd SHA-1: bd55b6a9fa26ceba37b93126813e4083f6e17755 SHA-256: 310cbf382e10dc9e17cc75d38026db89880830ee1e365caded5a82b24bc509b4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://dok-vo.ru/userfiles/file/69628796715.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728fb6dcd3d---80616673423.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fe5d1723a0d6cb2f05d59315b67bdd0b/derodejumopaw.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16d85e85ffa7477d555049b3d9b3fb7f/10287516153.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a816f984540---2648991565.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/e8qdqki8q3s89dmg5884ivkjt1/61768867674.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b626bbvul9vkevr0vsq98i66tj/16607418246.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4f0ddb63---84071851430.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63224c35cf---38062047049.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f9b1710e627eca7685224a74f77e5e0b/27227013731.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d465b6202---wakuridabelopajebumevo.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642208a35f---78776242153.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t1r7vs0th0okt1rn96mr1qm9jj/73813342128.pdf
    • https://discovercefalu.it/_data/images/file/65899680238.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bpva6gpd4d51ke83ojopjh9rg6/mososa.pdf
    • https://adepotcustom.com/UploadFiles/file/20210504115911126.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/pelikobidemazipoparof.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c36f7492008---wataxivejiriguse.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/0miokjutj9k91ifkif7l8nrfct/fotumuwopisaf.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083d11058727---lugatixodevubelogusudo.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bea18171---putewosujegi.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e53b1d34a50c685e80d8589af81447b5/1917560489.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/0e6e459e4d5c9d16d5faadf05c4b84f5/48611370234.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=manatee+county+notice+of+commencement
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdcf.bin
b98398f1fa26aad6e098aa7b320fb1a654aaaa6acbed4d124aaee9a9c2bf9811
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 16600 bytes
font_01_sfnt_off0000f90c.bin
e58cea56dfd3be6af804a66ae0f791e8d20894dbe485617053b123085848dc23
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10392 bytes
font_02_sfnt_off00011098.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 16792 bytes