Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6230605cffd7f75…

MALICIOUS

PDF

72.5 KB Created: 2021-08-05 09:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c71e02eff59a529c30e88ddcacff3320 SHA-1: 6e1d7b98b14b4acdabe534d7712897dab773bd22 SHA-256: b6230605cffd7f75bcfb152d9f27e458546d10657064787e74fefda9baeac052
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The file also features numerous links to compromised CMS upload storage, indicating an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/orr4ems8l065qseqcomd9on8m6/60965143801.pdf In PDF document text
    • http://mlight.cz/archiv/file/19193494858.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/67023795478.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/28478232106.pdfIn PDF document text
    • http://timebymtm.com/upload/files/34928628731.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/5835029194.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/nesevusovora.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b551e1f3---51619544162.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/99318063169.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/66801837042.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1ca1a8e8e03e371402ad7ef7920b47a0/51843200431.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b92f32db3---41984122159.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/baxefejomezudokenir.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/naseligofidasaw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1191ab93f---39533279829.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb265763b06---595192037.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a942fccb9c3---laramokaboxinasutud.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/65800776748.pdfIn PDF document text
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/fujubixopunukaboba.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/dewunafikokab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+open+hp+thin+client+t610PDF 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_off0000bb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 10460 bytes
SHA-256: 29e6b5a1f9fdddfc42fa320bcfe1db0fc5d0172d57db68a98cce72a9ad8d6dea
font_01_sfnt_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 15204 bytes
SHA-256: 29de48f42853b9fed0d46ac98df586a7d2115c5c4a46876fc33ae7ecc2c6844f

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