Malicious PDF — malware analysis report

Static analysis result for SHA-256 49292ec8a1e46671…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 08:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14f576eb65b59f3d3ab704786bc231d0 SHA-1: 983ddf1907ac7dfddc94dab7fe9df45492d2c45a SHA-256: 49292ec8a1e4667165a787869e9c8c9b382d83699821b9b09a4dad4f3d09ce4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bhttourist.com/upload/fckimagesfile/2294899093.pdf In PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/kitotatagunadeweno.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f491e925d3---kesisatefuvuzodokikip.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/berelegusefamizozupolibi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7247731854.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/niwumerototuziz.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/vepolibimufobuvititijex.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4680b0d309940d2c27a0e2aa387c3cd1/vitowevowinole.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/mutigibavikavasisasutivu.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/35589579299.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/lamupomedevetaruwegoxasim.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/patidufatiputawamenuved.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/vikaxemesowe.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2m5gflplslbjqildc31qrmsn20/20622839427.pdfIn PDF document text
    • http://favourtec.com/attachment/file/xibubewop.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/85a27c13b9f9a4b73a23f22a178b60d9/94385663777.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/wolukuxelanusogurenize.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501071708951686.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4818df1b890538000118beedd482dcd4/xifefujavozewisizusuxofut.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/xugizufozo.pdfIn PDF document text
    • https://etimes.mn/uploads/files/60044863291.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/93325075944.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39360598170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=safety+in+petrochemical+industry+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 11176 bytes
SHA-256: b20d1937131954de0a986b58f11d2282d62e351ec1be424b5e09ee50b0267535
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 17124 bytes
SHA-256: 8d2113882d4d93fb6e5b3b742e35ba69682c6fd812ea01ca8cd68f71ba69fbde
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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