Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cd344528b6932f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 15:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: baaa4b7f732adb49774fa5c999632338 SHA-1: 66b8822e6dd101fa9fad138f6095298a16e494fb SHA-256: d8cd344528b6932fe712506c5c2945c2aacb195a526849de13032f6817aae2c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=real+racing+2+download+ios PDF link annotation
    • http://tonioloclaudio.it/userfiles/files/pupito.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795bea554---bezuriruweranive.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/velegojemuxusedu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/tuxajisonixudigotideduj.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/71249653050.pdfIn PDF document text
    • http://3sdent.com/upload/files/98950100003.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/92793695850.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/najuvukumamorovagelup.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4be79f48---porekuditetovewoxaxaz.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325fdbbf3af---sinogupixofome.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/72129862023.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/mipepimumawenurugiteweri.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/wewib.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zobewebozikegilituro.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/dafovebiwimodadekudizu.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/22001345527.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/nuduvekej.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/xaguzanozajamaj.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/52608182961.pdfIn PDF document text
    • https://successalpha.team/upload/files/lumaxelajamu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5904f7dc---sejeroj.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/xutinojotuxi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/90071769929.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/pemim.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/48734391343.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/radisog.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613caeec62a93---89959169092.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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 17184 bytes
SHA-256: 88de739fdd6d7c9cbf24471027d0c22b1f9c4c12c44a507aa9168c187e3951e3
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 10700 bytes
SHA-256: 305d76b5ba486cf602cf647c3facf40925fd979c4c47869f2cb9cc56c62e245c
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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