Malicious PDF — malware analysis report

Static analysis result for SHA-256 3953ce3e85648a14…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 09:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8b31635e0f0dbaca891b1a19a0270ed SHA-1: 487aef480b0fa2163c78ff16980b38b152e6a95a SHA-256: 3953ce3e85648a147927cf5c35e90a1fbfea5d439505d460fed319ab9fd51843
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable domains, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the nature of the heuristics strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=whole+day+meaning
    • http://varanini.pl/userfiles/file/50665443969.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5796181087---viwowifirepeluzekarivubow.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be257b66f09---vapisobiniregibufine.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/71m8pr2c581ei3nkqhu42405t1/11400483873.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e0cc661f---nivonixeke.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c942c7b9c7---gojakupe.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cd0d41a630ff6d25d211e8d0990b399a/narutufudes.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608feecb575bc---zirepapag.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f318d8db---befufe.pdf
    • http://vitaminyplus.eu/files/file/56549568752.pdf
    • https://allcreaturesinc.com/files/files/xelugoxal.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec3ba5fb5---rilesetokidu.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116b71d2f4---xufiserimuxerezuvibu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c1763c6e596cadc89743df8a56fbb6ea/kosudedasurafaloxived.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/q8qkm1onkvgh4c11pv5vd93acn/81680685697.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14ee31aff---99430434858.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38d84e19f---lejomi.pdf
    • http://shinies.ru/img/lib/file/12342170465.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/36983b2372db3514f9e0bc5ddbf49b69/mogunewir.pdf
    • https://fonixkoncert.hu/upload/file/53317074324.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h1703364jk7unluq5pq8s120q1/diritinufubakedabenetupak.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3p7nj5jdrlojersq7tsk8s93lt/kenamoriwesawavegiwoxevit.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/55513762099.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_off0000f12b.bin
6f86246ac97aab95a097aa60c30f83beab3df22192a4554d25135aac21a76199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16544 bytes
font_01_sfnt_off00011bdc.bin
486093a3d8c24ad97f650b83ac1fe83c9a1d53a428bf96804aac95da0f3945da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 10436 bytes
font_02_sfnt_off00013316.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13316 16792 bytes

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