Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcc773031cdde29…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 07:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0475f06b029f8fa31aeb616b17077f66 SHA-1: 7672f1f300be796fc6acbf2c6a72e5c10079093f SHA-256: 2dcc773031cdde29d1b47008d56f2648f57c1ef5d694b269ab324db782161b2f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=golden+sun+the+lost+age+rom+download PDF link annotation
    • http://mimarkamilozkartal.com/userfiles/files/zirotelekefij.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/86628648760.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161556ec82b8fe---nakufor.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/74122728173.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd3fb5648---kagunidagororiwarelu.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/45011695924.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/reluzer.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/46122469761.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/kitokom.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/65017785661.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091312103873499.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/zomegaboliviv.pdfIn PDF document text
    • http://17njl.com/userfiles/files/28663021634.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/jikixutalasubada.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/zepewuviwede.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/migapiraduko.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/50abf3caa9abf54fc90df913355c7605/93449997401.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/27177751744.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412bcb0c5d4---48936959202.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/mevabibebevijoxovivedunu.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/41336377702.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/rivofefeninivakubi.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vagos.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/befuverilonevovisoradunex.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/jazonatixowomunizozikosu.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_off0000b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 10828 bytes
SHA-256: 039766605723273d596511e41abe387fa06f34d7b169e10109b5865bd622a6d0
font_02_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 17888 bytes
SHA-256: 7763c4283a60c20e433d727c0f853f87c615f23bf798e33b0a2844ec0f3cfa05