Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4955b525a842464…

MALICIOUS

PDF

81.2 KB Created: 2021-08-10 16:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 980ad1e5c93d27ecfb0f49f1948b6b40 SHA-1: 0134b3811177f71916a13bce6012ea5e35de4dd9 SHA-256: c4955b525a8424644b23b53ab7e86e441a7be149da0a3a0d57a782454df852c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=problemas+de+fisica+campo+magnetico+resueltos PDF link annotation
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/fc166c5bb3e87e1e36bba9f85a8c967f/71768399369.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/8048956027.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/weruvomepoxovow.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/68912011131.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rpc57qbkcnc4bu9ljipdeufhu0/82480990699.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/laxefaxilezonus.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f03932b37949206b2e5e55346ce3715c/baladinepopebumemo.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/tiwuf.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/be84030dd427e18c1eeb5aa8a1003421/xoxokobipewugapapixe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/bisosuritekozimebusevera.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16202988322939.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cde8b93a430451b6221eb55f92486410/fepabatoranap.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/fogetativ.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa5b88461---4378593190.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/bavutupepowur.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210716015002.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/77a82a8e77ecb3b8dc43745bf7049c7e/gufakemadi.pdfIn PDF document text
    • http://dentistturkey.com/image/files/3090182905.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/2535484127.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759393a81a6---51527015137.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d688bc5b762---wuzodipasafaxasiga.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/disibijigozojelajad.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/75279352245.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2defaa4507---10245343969.pdfIn PDF document text
    • http://dmkert.hu/files/file/laxupudikokadoxisemup.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160776d5f03161---satodore.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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 11204 bytes
SHA-256: eeb13d97d691d89bd61c422a611ba8eb5f6427677ba858c15bfcf0bc12601bad
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 16808 bytes
SHA-256: 762eb5d8fdcd3077a4ceb18744cb0980dd9dd6ad6eb6510261c594f3580d404f
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1