Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac448717343614f…

MALICIOUS

PDF

97.5 KB Created: 2021-09-04 13:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 198be96916ffc0ffb26cfac7a256429b SHA-1: 393a5d65c3647430588d37226143f919fa29b9af SHA-256: fac448717343614f8ec0638f8c91cc73a86a70250185573f991efc74c8f78fcb
216 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing sensitive recovery information. Numerous embedded URLs point to compromised or disposable hosting, likely serving as a link farm to distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b000d4f22d5---mokusonukumoxomib.pdf In PDF document text
    • http://csc-0898.com/userfiles/file/20210705032747_c0wrdm.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/nigagoveboz.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/29704838527.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8968471d34ca50cdb9c4f717ac26d057/lujurax.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/tirixofinimezizumopoge.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3dd8dd88---11899378862.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/gunixepurezawoxisujode.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/76305904476.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8187e391e7---fobedejubuwajorubelokodu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2d4b1481---742015826.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/25266621778.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c589abc1fd---wunolaboba.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/34c88d1b9a4f7b4097b7cc6eae743d5a/timedage.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/74192689996.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087af38d00dd---79570166519.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8a117e123---46855090169.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160853acc2b221---xudojepezalamamejulatejug.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/27097658282.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/getarenufakopebujiw.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1f2d85c9fada6fb7fa6aeb2dddd12549/14942212146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=impulse+%26+momentum+worksheets+answer+key+pg+7PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_01_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 9784 bytes
SHA-256: 29b9e680bbabef68a85cca3d26edfab1949d1e8488dc84f3ad0c736eb0fd87e5
font_02_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_03_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 28240 bytes
SHA-256: ec95fc7d796d256a588424ab36db691d03ed7e515e5b2a0224678c969656586c

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