Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dc3ba8a45c070c…

MALICIOUS

PDF

92.3 KB Created: 2021-09-07 00:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 89f60988353531f4a2584d47880efc47 SHA-1: 0ca9195163d444ce814b1a00412290e55d2f4ae2 SHA-256: f4dc3ba8a45c070c442b8d33d6b694af365b1371494360e74b4274721bb6d54b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://parkwaywest1974.com/clients/861606/File/57252910976.pdf In PDF document text
    • http://angeladaniel.eu/uploads/files/81481778905.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/baxebirajirewesezotuxakeg.pdfIn PDF document text
    • https://saam.vn/images/content/file/jeziku.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///58498636311.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df532941c04---54794060474.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfaf5e06fd---95669638095.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/14259663516.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bt58q03ic95c2pta2b5g32p61g/25100741580.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/28806694544.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/23086577353.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836f07bb7ad---jaduvomefuto.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/99bf26e67e421ef6f16aedfbe36ec387/jupitodawozefa.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/57104557839.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gebapunevunuj.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/kowixalojutiperan.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609438c548941---risifazitasefa.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/kijewibobekokezula.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2b3359ef---pexoliribatupimanojusupaz.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/71719649198.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0ba43e585a4cc3d2d374dcce2c63c2a7/fidedezodebegesuwuragum.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a6608039---besasavunidurufinazitoton.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/12099637129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=derrame+pleural+paraneumonico+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012c2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C2C 18624 bytes
SHA-256: e026410946195489b6ce499a413d05d5e4df08b329204de38a333203f9207ad1
font_00_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 19488 bytes
SHA-256: db88d7c5e1286a0923e209628771c57bd07ff3769b1cda42bc0b2a55f7d4058a
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10616 bytes
SHA-256: b8af929581e5b3bf1427554691e4b20e5a6b826561921d3a610ffd3526bdad7f
font_03_sfnt_off00014ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1