Malicious PDF — malware analysis report

Static analysis result for SHA-256 88656e38316a3e5f…

MALICIOUS

PDF

92.4 KB Created: 2021-09-02 09:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b34d5b22ae257d71cad161b73c87880 SHA-1: 41022f99e48d86cb298d1a09a5a9a9a3986de0cd SHA-256: 88656e38316a3e5f410ad8c4f1bcb847a9aa2b34812d3fc9e713f33e1b2e2e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external URIs and the overall structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pistant.ru/uplcv?utm_term=bannerlord+money+guide PDF link annotation
    • https://flexi-cms.com/uploads/file/kakabume.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc20c43eea---4713897543.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fdcce303bcb---41897470527.pdfIn PDF document text
    • https://sanidom.pl/img/file/zekikefulo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/51835652502.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/4367c9f9d7f41ee595542895632b75bf/84932077273.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fc17d8188906ae99355efb593d6a0207/90525790148.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9c06ed1920655ecf23b5961ba15d25e3/pazebavugokifibifijogozom.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2ff861512ee6af0ea503dbb0701a4413/81053921869.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/misabijas.pdfIn PDF document text
    • https://gangnampools.com/contents//files/wurotesumesuwiboziburu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8158d527c---70221453704.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/19810868716.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/28043063142.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/17117028020.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/92231154498.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0774068a7a---58705077222.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5810ded9dd6bcc91907e75bc61914cd2/16944534439.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/xixojenewobivagowik.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98278455930.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/fitufimemajavekuju.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4e56824550c1c6129c73b4613e93ad64/tivigubomilipuveko.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/93057452890.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bff0ceb21---sipez.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_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 18696 bytes
SHA-256: efdcc65a482926f901e86f3f84238a808925557a0ef3390febd4888b42c3a3b6
font_02_sfnt_off00014bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBF 10592 bytes
SHA-256: a3d5bccfc3736928a85803be9ac958f3e9a78c65f1e4e2c39d411efabc31ee8f

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