Malicious PDF — malware analysis report

Static analysis result for SHA-256 f610b4754298c79c…

MALICIOUS

PDF

79.9 KB Created: 2021-07-26 19:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 326cd04cbff67761da860ba006c40006 SHA-1: 1a57e5d4721d53c694b73d3912a7e8b3f9cc8eb8 SHA-256: f610b4754298c79cf848046f89531d972e510c26a4d5c6398da86f4cd0992a7e
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 multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and URLs point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e05472e1---zarumolatuketakivab.pdf In PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/e1eqmldmb24ttmqhcs72lbb3f1/29976174587.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/5429266206.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/22905182850.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/15e2d524df1269ac9181114ead0f4d65/soxozusogekekixenimimiwel.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f6f1ebb59fdc231c19e6b4788f7d5c1d/musosirefi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2935db96de---genoxupuwus.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/3724288225.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/92371532008.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/f83ta2cu30hpk788pccf5glmtt/91737266884.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/fafumebafugamakeda.pdfIn PDF document text
    • http://sam-global.ch/files/file/46900209222.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b89de656546---11840103397.pdfIn PDF document text
    • http://nature-revive.org/files/file/12407221542.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/gigizaw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855b443cd98---81935498966.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bb520a25610e2ef8184ef48960af95c8/kiwupovepiteda.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c5676453---xewekimebifuremukun.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/nifitavojujegejise.pdfIn PDF document text
    • https://andana.us/files/files/sosobaxezedororuz.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/28258214388.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edecb24c808---zerezulonumazonixati.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2623f83980---44827511335.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7tvfire10tvmuniu227iapfo65/fezuluvujavajiziwe.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8u5e2aekm0bm4sp8c0o09hkgee/12954505854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=4k+video+downloader+reviewPDF 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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 10200 bytes
SHA-256: a6354c860644bcbf2ab2a70da8329ec523b5a4aa58f0504c5f46e83cb63bd067
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 16308 bytes
SHA-256: 72a6f0f89830c78400e55f73aca6463fed3d19f67b57c9b2576bd7c9b12ed6f7