Malicious PDF — malware analysis report

Static analysis result for SHA-256 1291a5bb91ff4c04…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 16:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b908e9fbf99f551ed25f686bed22af3 SHA-1: 4752b4421f361f15af787e9cf1161d00ace031ca SHA-256: 1291a5bb91ff4c0472ab6748d52cad2610f637897ebc01c4ad87ff1495048a94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malware droppers or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=joomla+website+tutorial+pdf PDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160842a56217a0---98026714994.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fcf8e704---40166888370.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160951bce57a09---gimezaneno.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f10865f2772e0224842b66f5518c5c3f/bisevomagexolizovuzuz.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f2d2d691c9096e6d64fef5f8a677d7e9/21558562652.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/97226449260.pdfIn PDF document text
    • https://egf.tw/test2/images/file/96633970861.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/26827261624.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rexapu.pdfIn PDF document text
    • http://livestocktool.com/d/files/22643719200.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/80094098794.pdfIn PDF document text
    • https://togeltop.net/contents//files/nomituretazefolizoguber.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/palexe.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607558032d56c---virizekixi.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/nizutawodet.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/77817815827.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/jepataripelivopik.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb63dec0d---rirot.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/mesebik.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/49764666988.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/10198389402.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/89508465873.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/tison.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8b2e76e57f7e95f9d73f63081d51c510/5239975227.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5c8c3f4f---zeleni.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tutujetuvigor.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/lixolupenajerefagepa.pdfIn PDF document text
    • 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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 10872 bytes
SHA-256: 1210099d4708ee398fa71d822ec3e7b0f79dcee86526f660cacb892b5c4ae891
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 18656 bytes
SHA-256: c66889a457e00dd3e23ed9bb204cab4f5f61bad75781812180d06737a458b5d6
font_02_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1