Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fe4342417e5e57…

MALICIOUS

PDF

95.4 KB Created: 2021-07-09 23:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d7404fd51f49390d177bbb851029a276 SHA-1: d7f9e6461b17a06827d85054581aacd32aa645be SHA-256: a0fe4342417e5e57fbd6d0096c610859a53fcf92bb03cb36e3392f9aedc96e22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious or phishing websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://pixomot.ru/uplcv?utm_term=the+science+of+addiction+webquest+answer+key PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095f3157f567---vagupos.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a1314994---15930645631.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/28835542170.pdfIn PDF document text
    • https://aksusu.com/upload/files/60348466313.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/17348817298.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i4ntdroatht1er5faustgfaad5/95029045663.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc16969cb---kowowediwozekijamomilidal.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99c0e8708---muwinexediv.pdfIn PDF document text
    • https://ubranni.com/uploader/files/mogamodirosum.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/nixavetezuzi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a851c9305c4---jogikiwizatufovopipog.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/96660966836.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/53753496890.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/takezaz.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/66638554698.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13c189c55---wubaratunofubudiramaluk.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/efe80591c9f8bdbc82dd51859b858e0f/dosepokipuweradevorovevav.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/31747431379.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081653d358f3---dijaneli.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/1334887261.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/88274451343.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/31884af5b487668770be83bad9d232cd/46223062427.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5d607dc0d4acb37d0d2f0c67e366003b/78817232349.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/amk7b531gq1utellf65ugckmh3/remowijudadif.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949e47022f6---55632352994.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a5518795---vuwixipuvezugene.pdfIn PDF document text
    • 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_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 11168 bytes
SHA-256: c6ad75f585603a3e5bc44524a04edf7c5242309f6100575b3b9f57640fab41f8
font_02_sfnt_off000140fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 17872 bytes
SHA-256: b644f622268b8c9600b2e37928797d6650de2b0eb6434b9dc7684abc5b71a4fb

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