Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a58f74d650428f6…

MALICIOUS

PDF

88.6 KB Created: 2021-07-24 08:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef3c188231f99ee4c1b8df477b5f22da SHA-1: e7190b3d0a7a9de6d3b3e39ce168ff4c86827ccb SHA-256: 3a58f74d650428f6eefdf5563f5965facb8440d199ab5db2922d249b4dc83cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://dailymaydemtien.com/userfiles/files/nesufiwat.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a879a870---gupejemosawimafa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c9fe934e8c79d853901d28e5a12354c1/36714489141.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e089a284937---dugiwovidezovevenudojuz.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t7btitnr1smir62tkg993mo93n/60388952.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/69249357865.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/3192638607.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/94580579536.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210714112132.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7bb1e9d7---31476736158.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/33105574094.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/fea5442a4bfc3416aa4814e47d7db48b/18496404267.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/xexisuxobagakot.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/lofavawikutizeves.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/34815890698.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/65397845536.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9601da8f3---sumopupufobuwuvasu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8337039b838b261f33ad7efe20c4ab4e/tamuzunan.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/xuwaluveramomarinuxeto.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/rowazifokidonakibonelusew.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/11509014025.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a776cdcda---zitujusunakanajuwegebam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=significance+of+the+raven+poemPDF 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_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 10852 bytes
SHA-256: 302e825cbd46a81cb4de2b1a154af1e10cea11ca01906eca7686cdc74781aa93
font_01_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 16928 bytes
SHA-256: 47beedbeddd652e673216235d62ec49f7e8eda1d02b134682b19dd649d03bc59
font_02_sfnt_off00013d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.