Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd54df7aea76cbe…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 11:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86999890aef9980dbd33b6cd91b2c03a SHA-1: e2f75b124cf7435fa99c6efbac8bc37452d06653 SHA-256: acd54df7aea76cbecdae0f0d72a40a4e57a868d92aee180ca69ad74b5c6c1f5d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' lure further supports the attack pattern of tricking users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=the+first+transformation+for+this+composition+is PDF link annotation
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/fa74c38739cfc875e70490265ecf9d78/bepidin.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31dc896d2.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0a938c63e0bd7321c18e17bf965609fa/morukamuxigomonutibid.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5bceafe5e---dewasosikemipaporixuwubo.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/64367618969.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f122b2ad9d---64809463322.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2176e174c42b78f7f92f290330f75055/wexilegun.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf0cc4508---bujiniwogenef.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/51540690403.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/dinoforuvibidizeke.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cf20beb1---mobipovezakev.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/subumutozejupuxoxafozi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608475f06c78f---97514946107.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gkulg238nkqssh7d4kd6djb9h6/32659589184.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/pigeratujige.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/lamakidupa.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba34461db82---8578724281.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608913f496245---6205307614.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dacafa5b838ccac4ac5c43caf00c9c50/jerowid.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ea13384376339726da6c8d737c0d78a1/zejiv.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/foxesakedafazufu.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/gogevopejobozujobebajil.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/830ab18162f339fc1111fc68cd202e32/vuzoridawemesukofelenobik.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd71a4dcbf---runurizopevo.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_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 10664 bytes
SHA-256: 0c9538568fad8b942c504eeeee6b8f0f4c60351238bc5155c5974e6ace02caf0
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16968 bytes
SHA-256: 4a87b9e640fe4dbc1654d164d9ca63f0bf8e21f0fbb7f42330be5ff19b61decf

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