Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b78e7aac886e778…

MALICIOUS

PDF

108.4 KB Created: 2021-07-09 15:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3cfd73edc0c98753a4680c4a6f3803a5 SHA-1: 8aadeba74fe75b58a56b1742c9853568c5918ba7 SHA-256: 0b78e7aac886e778f6d46b33cb3317f5551732a7b7f285dd3533b3d29b0c98bc
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to delivering a malicious payload or redirecting users to fraudulent sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://dansensvenner.dk/imagesfile///jiroduzanejinukikeko.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514075523784764.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e9bd48edaf4a410895a7b9b4000aecc/9496490191.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/99746307188.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd7185a61---pajoladomuda.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c6c5fb77760a8b96c85448b0165d15cf/28525401237.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/wewurafuj.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/97998637671.pdfIn PDF document text
    • http://stattus.com/assets/file/jeditud.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763b15ce694---gimupapusomedevifetorituf.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/250716936.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ae0d30ee---vekorofikesefedodojeda.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0f3e779230aa059b7f055c88e885fb98/denulajizef.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522023201450930.pdfIn PDF document text
    • http://samtekelektrik.com/files/63730001397.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d8db888be6097c49fd76576fbd3e2755/33475937851.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080869466bf3---12156384352.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/xipaguvamerawiz.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f26c773fad7c0db6194ff1882e5fb658/widapiweza.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/nui1d2ie4hn9pt7jd5rptqbp59/42690015776.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9jb15qrm1lkaffnei2a6oe9k67/filopokasejujezemumijepo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2de8748ead---53177761737.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cd6c6336f---62805960308.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/subagawufu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce880857366---ketebebimomasulorib.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/806625d9102f6d84698b093c941d2e0f/87572944785.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/babafafedir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=crimes+that+are+not+deviantPDF 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_off00014612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14612 10564 bytes
SHA-256: 8845ce10eda4c51948075e08c85e3f4eb163ee854dd99ee56da788815a57bb2c
font_01_sfnt_off00015e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0C 17828 bytes
SHA-256: ccca349b6d8f23d2c971a22d9ca1925d18c7a22f9bc7de3906b041b55ccf1247
font_02_sfnt_off00018bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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