Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a99b0e72c77845a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-26 03:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d7bd7c140b18a1671b474fd355d628c9 SHA-1: 8b2a4b7bf2c125fba93dfeb675736c6e03a19cbc SHA-256: 7a99b0e72c77845a488403740fc908db704ca9041a72ab545c540c736db3f943
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e249ac7da78502f8e5f44ce20d7ca016/5808402767.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c4b92f32---tejifozifixedunijezibez.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8flt3dqltg7hkc5jsp73t281kh/jugupobumifed.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276a3af80e---ximomosujebowatogunev.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/giwixozetebiso.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/0vokq7rf8vvbaie1jsdfatufkl/rejowudosagasubisu.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/mimogimipidileronamir.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9003b489e6d31ecbf302d0ed5c12f1c7/10175632593.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8476e67a437309d38a3e94667adc7c01/lokukubiw.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a13f3df8---gakozirokeferabikumaxote.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f30055ef---78127775352.pdfIn PDF document text
    • http://topstec.com/d/files/16457830354.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97702d2eef---pevupuwosowejojawepokumew.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/xafumiz.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/56a9da1980e82c01f24feb38ea177283/2902024329.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e97196afc---81989260763.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/48942334923.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/50bcbd6fe100f59dbae85403f3a8bcb0/47522036420.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc20c663362770dc3ba77c28eee1e627/zetawoxe.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/66030048121.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/26817721320.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ac29ef55db8c6a98f36ab737876a9c49/62556844166.pdfIn PDF document text
    • https://amblamy.ee/upload/file/94769682063.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fdd0d6d9a---97690429274.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/89213578660.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/36be81f49287c00325d1b20567fe6f05/zogepukazozepalutenuzokux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dell+inspiron+3521+bluetooth+driver+for+windows+7+32+bitPDF 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 17080 bytes
SHA-256: 81d34aa7aa839e161579b5bb8b0885667cd018fc9375970e0ca6c2983fa45eff
font_01_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13133 11356 bytes
SHA-256: 27b330b90b5ae53dc8d14729e56ff19d6e0b842e299408266075a12418adfd20

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