Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bf74a7a0bf49bf…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 05:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b51c981daddcb6c9b7f41b204cfc1604 SHA-1: 60a7d122f37882d4d4075c655cc2f799ee1f0962 SHA-256: 87bf74a7a0bf49bf12bc7ba640b69126dfdd0bfa815ca4cd7da2799ebfc26e81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The embedded JavaScript stream suggests potential malicious scripting capabilities. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=emulator+ppsspp+apk PDF link annotation
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae430d794---86809298307.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/16608850453.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/91bbad46c44c11b3f3a3a19cc5027a7c/5050070723.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/44838589842.pdfIn PDF document text
    • http://emaaravm.net/upload/files/43118895905.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/parojunesane.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905212506_1u7o5a.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/40643399885.pdfIn PDF document text
    • https://podimercrm.com/img/files/rewejuxukete.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pumogalugefezurovemu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda4952709---rotiwu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/65711010774.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/muxuw.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/93834839401.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/dg3gbr6vcrn2a9jjmeql8rki3f/68065922506.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/sikatezatana.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109090151365317.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/94429776465.pdfIn PDF document text
    • http://boldogelet.hu/media/sowopof.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/75587786607.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/56964884732.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/pinerugaludiv.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/rolofik.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/79611098107.pdfIn PDF document text
    • https://33mobility.net/uploads/files/45723240177.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_off0000ba0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0D 10260 bytes
SHA-256: 58d6815a720d2921da04f2b2528fc03747a07fe399ca8a0c9550578277af95ff
font_01_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 18220 bytes
SHA-256: b99450d9f821f5ce2a0830ec6e90df59f2cecabbb1a8fb22e7c6b6fc4723bae0

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