Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada3c184164ef7a5…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 02:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f6611b35f854767dbb853165d1b8435 SHA-1: 8217af2e2ba24b59e399c6bcd2a00a241706383b SHA-256: ada3c184164ef7a548c63441ff2137e42bab05c596234917df33973ea3b8dfb5
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://chcial.ru/uplcv?utm_term=fun+things+you+can+do+in+minecraft
    • http://animalscipublisher.com/files/upfiles/file/futopokaxubudiza.pdf
    • http://altinay-law.com/images/file/21833186242.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/092ff0864e232babb0a1778e09a74a14/rakenige.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/4b387cf8c6d781cabcf3f18587e72dac/xomobeg.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/nemeborekemipabozuf.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798ed0de5d7---fafelelugatotorumi.pdf
    • https://oceanflowerhotel.com/uploads/image/files/6061865452.pdf
    • http://begemot-rus.com/uploadfiles/file/2021060503054673499.pdf
    • https://autotrans911.com/thread/admin/uploads/file/2120263380.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84fea0725e---lakowexupaxu.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072497289103---47323969318.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/77890f0466c52c337e97a624bc483761/7599439109.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/95jim0iud5sieqcn1j6905ffg3/26353712461.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7d96ea08a6fd9911d225eec5cca39016/subosiwud.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739b5dbc1ca---3447731365.pdf
    • http://dh-life.com/ckfinder/userfiles/files/mejizapoluselapixew.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716786ad2c6---sudugega.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609032c4c3bcf---vozim.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/025309337879c31556f9fa3db898b3d8/xapedatowozepomutafuweja.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//1543271931.pdf
    • https://augsburger-dartliga.de/uploads/file/48056446454.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3crq2p2jsku1hgqdph6k9vaped/kidisiradu.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a7c752b5---rexixemulopefi.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/18362487904.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b42cc4304a9fc8dd53e7f4960c2453f5/50547940789.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d23c48711a0---48864182950.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef42.bin
8689548fdec951dac3e4c85d1564ca71cd4b7fca32dddda3e7395a7cfbdaa02a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16624 bytes
font_01_sfnt_off00011a70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
font_02_sfnt_off00013287.bin
1d39251efcb7d3570e1ac45ce4b4764c5f0f4f6be3ffd894f2e419c67b4bc0f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 11068 bytes