Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10594527429714d…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 23:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a509d7fcb657c0f6d6e26e82b63893af SHA-1: d9efbd4befca6a8b58e060f8c007f2de9a5d3b80 SHA-256: f10594527429714dd710c7da49e41e434a0ebc987d11a1f41617b407225af3a4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites and disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://bienbao.net/uploads/files/sirabagiwijixulezezalo.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096577429c1e---5778121089.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/zefalugiladututonazafewov.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/muwasefajulerewoper.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v040054g5cqunnmk75d47c3mt7/55755983920.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e1ca39b01---delagomax.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/fajiwusuvukezovikonage.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/26000082888.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/94424927234.pdfIn PDF document text
    • http://magnanelli.com/userfiles/file/67982898574.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/56290183190.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4e10a7c8---dagesudegaferepanudojo.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/muwiduvutewixinatepisapul.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/54963030470.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/famutodizidebe.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/zumagokalowojitakejibufuw.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/wanimusexazulalojasema.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50302622162.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/11caec7170ca44f9183d39c087fe08a9/juvukenun.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2940661c088813f39fc27ccd2c2e7881/suwanamefetigolifex.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcq4kmafp31u1pdf15r3kk96ks/jokuwilaloxori.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ssh43ltm5esmahusmp7pgtn632/68302900251.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/to2ji80n9qqgm7ke766brjaec3/tuxikenodufutotiba.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb6c6d0c7---jugofelezorotepadan.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-17/20210517035630110597.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/30547603810.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/47793734347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gest%C3%A3o+de+recursos+humanos+em+pdfPDF link annotation
    • 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_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 11152 bytes
SHA-256: 544df1d27436c842aa4f5994d4f22edea8edcb4d24b2546215a92ae963b7d3c8
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 21548 bytes
SHA-256: 7487f31b4be5a0bf26509c290aac2ddc7ba38e7ce183f21d747296ea997bc2f9
font_02_sfnt_off000141da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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