Malicious PDF — malware analysis report

Static analysis result for SHA-256 7530d9b2ee3fdbb7…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 14:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bb8c19cc3890e0c33b6c15cb250b2da SHA-1: 17aa4350bee9b71cd283bd0f9ac2c329c22eebd2 SHA-256: 7530d9b2ee3fdbb796dcb3437bd5c3dd6de29b46650deedc963b4dc08bc38d39
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=sore+throat+for+3+days
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7b6d33ddd23394181612e2b6eb15d1bd/tumunijibigog.pdf
    • http://amadpich.com/userfiles/file/jaledubofesefowarulufume.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3859e434---13069182009.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/athokvvvicpg5gj6nmde75jspm/memejurorurezoxigatu.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/65umfujrgoopl7togompm3kve5/fomem.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3f9cc9ab---rodazirilutofa.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92d510a4b---muwidajewejawarogamo.pdf
    • https://tecnicadovolante.com/images/file/49070926853.pdf
    • http://smeclassof1987reunion.com/clients/37165/File/52732267097.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076fdd086db6---80853026659.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/75aef14ab58ff66b282f4a3089beaa21/jasurupovuvuve.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/93954648579.pdf
    • http://sacoorhealth.pt/site/upload/file/54638737649.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jqvevc0fm9iqo2fobkrhal2123/rokufexozanulajifilu.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fdr66b06ro7rhtcd7bh29hvbbv/2765600877.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce84579c20---laseponof.pdf
    • http://hanart21.com/files/userfiles/file/penerofamojokuxumuf.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160997e81676a1---65280059939.pdf
    • http://albertopizzetti.it/userfiles/files/faxapoxefutebirikusalu.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/02076e5446783c24b79ded143718e51c/46893002591.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/j2lqs1d7tc5tnt2k5m4cd79ia2/4426261830.pdf
    • http://absigorta.com/E/file/nogizog.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7e9311d72---62637304162.pdf
    • https://thinkhigh-tech.com/d/files/firuk.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_off0000f4fb.bin
79413e7ed8abfeba5ac4161d54849f69b512433af99c966df68d214e79659635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 17552 bytes
font_01_sfnt_off0001226d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 16792 bytes
font_02_sfnt_off00013a84.bin
656d5f73a6491025f4bd4b251ed833af8eee58367deb4661ecfdef074e9d076a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A84 10572 bytes

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