Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac157e498e3c079…

MALICIOUS

PDF

103.2 KB Created: 2021-07-07 17:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8daea2ab5321e693e54208225beadfe SHA-1: e6e132aabee977afa6ac9ec623179f4dba621579 SHA-256: 7ac157e498e3c07961b2dc0a68311bbb0e9b5b85163a8ad1d8e0c2fea9bed1e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://catamma.ru/uplcv?utm_term=0049+country+code
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0179c05273beb2beaf466d46ed7077dc/kebiga.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b957e47427b---90027501748.pdf
    • http://hanarotalk.com/userfiles/file///17546063560.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3ff9c98b---timetiwopanusebuxo.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078982580a72---kopevowagomejiga.pdf
    • http://soflocops.com/clients/67403/File/dulimajiwalula.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3620hvpuhph4f59ltscc5muhto/98818731245.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/mojomudisefevolufigivuv.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc917e07ab---21715475013.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9a3073e340ab3d47e0b13f591e98543a/87462272057.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e2f065f---39453600792.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qsb3i4p01nbrorrhugcjmln9h1/lasovejo.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/79539932955.pdf
    • https://dm288.com/slicice/file/99741650766.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607428422f24c---xelatumiximimep.pdf
    • http://pnmanagementsolutions.in/uploads/39603329319.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/41744175ee3aa563b72c96fa09c84883/39693784682.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7d03c909b201aa10e4af59f2137a037d/zitexeluwexim.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d531795039---48036746738.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38a92d922---begafi.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpva99jheud47ffdp3epjl3ju7/36440438246.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7d51cf71---12247072082.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/popin.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f908.bin
d84013f87185ca343dd5bb526eba97c19403d36babdec2322cd6c8517468a75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 19100 bytes
font_01_sfnt_off00011877.bin
4ae79f2ad9db933ce976f8db1e99bf96139c175e973397497ba599c4caef7992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 2564 bytes
font_02_sfnt_off0001236e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 16792 bytes
font_03_sfnt_off00013b80.bin
d0201eb834490722fcc90d6296da129bed0155dc6e318267e379b69691cffdaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 23800 bytes
font_04_sfnt_off00017761.bin
043530eaa4be31f88fae070178bd0256b7db8f3837bc7c463288409f6c31b8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17761 10380 bytes

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