Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a988a97eff6c494…

MALICIOUS

PDF

116.4 KB Created: 2021-09-07 13:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7d9da11d69247516bb0d76d3ad089c4 SHA-1: 0615ea762ee2cdd92c1ad7a589e48ff4900b0b20 SHA-256: 7a988a97eff6c494fbcefa69f821d5168bfef5574e48447cdbe6169dea6f3dba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://queure.ru/uplcv?utm_term=medicina+preventiva+definicion+pdf PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade9e1e45d5---tuwafomudajogad.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/xajasunozusobewe.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c1dc5fa24008d8d433cc7bbb5dc54738/fizajalikoro.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/kojofidarov.pdfIn PDF document text
    • http://roocenter.ru/upload/file/jojubadenepazabuk.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d8bd357bfe5---35808712155.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098941c728e6---74858612341.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/2773535224.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/winil.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a33657deb1f07494dc56bd58e931a412/lipelipogarexezeronomo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae1ece00a3---92514526289.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/10gu46p3akgp7guoo1ua57k7j2/8026387578.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb03b45555---kegelipinuliboj.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/47096250210.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/123326368.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/96083709533.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/26853736941.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edccdea9f92.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27591754218.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/gavoto.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/41396495592.pdfIn PDF document text
    • http://lobi.md/userfiles/file/85128437492.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5213c8f0---13177305041.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb429b7e2---zukewupe.pdfIn PDF document text
    • http://short-story.ru/upload/file/41201894523.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_off00015cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF9 10456 bytes
SHA-256: a76be328bb7f27beaf8baea02692d2cd931fc00c245f697461763e229757ff33
font_01_sfnt_off000174d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D4 21304 bytes
SHA-256: 79fb52ba8cef8faff0a02c17ab454736922fd88605303682c2dd76240ffcf953
font_02_sfnt_off0001ab89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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