Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cdc664d7b24d25…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 13:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2167f58ce2c39bb0d656921c166013d5 SHA-1: 7f133f1efc8f875640465c1d51a333a543a87f20 SHA-256: 90cdc664d7b24d259879d7f21e92ee8d57198bcf316703abd4d2d8e4f400b755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://www.oteliapelsin.ru/ckfinder/userfiles/files/zebibagemewisav.pdf In PDF document text
    • http://tcsklife.com/filespath/files/20210902195250.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210913_6762D6C74D0EA2D2.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/72881586645.pdfIn PDF document text
    • http://xsjprinter.com/d/files/zobosokujugubawirujamomag.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/37341367196.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8892e633facb802d9a6b4e1680d22c7e/88895415285.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/8913875398.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/naxizukapusag.pdfIn PDF document text
    • https://phukienbep.net/media/files/dukotigopom.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/tovesi.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/rokemazobifiregofoboja.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/diwadegobegedak.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/45292044454.pdfIn PDF document text
    • https://mlspoland.co/files/file/29530931852.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4ca0b55a---57369076040.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/lagaxavojupisaratudezozu.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62716470915.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/benosuragofimex.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/golalarosugamevuzox.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/pifupiwuxijebevezu.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/kevaxubakuno.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/67161139200.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/tepokamevilorofab.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/27875169688.pdfIn PDF document text
    • http://unseretochter.ch/images/file/fuzolalebiwosigupenotafu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138541a617f0---23318418608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lte+4g+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_01_sfnt_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 22404 bytes
SHA-256: a0f098e024cbef1b5f18ac1334b0c32f33d952ba9bdb83480d3a73c696868540
font_02_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 9924 bytes
SHA-256: 5de8ce3297f3c9ed8265325e6db948e3eee154d4e68edfd68158f9a3f696b16f
font_03_sfnt_off00012f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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