Malicious PDF — malware analysis report

Static analysis result for SHA-256 3373d3e9a719cdea…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 08:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41024301de314d3e7489fc5507a123cb SHA-1: 2b9c6301ba56c07963f41f9f1c66618d2f02b8b0 SHA-256: 3373d3e9a719cdea67bdebd8f8c5c84acff927689ea9fd722ca5c55f104f422f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple external URI heuristics reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/586f68f3be26463994db8844009fb150/28939761289.pdf In PDF document text
    • https://gikguamerica.com/userfiles/file/69439479892.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/28487233861.pdfIn PDF document text
    • http://terminsk.by/pics/files/belesasenavasepe.pdfIn PDF document text
    • http://newshop.jp/archive/file/sebezikataru.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/revativinutoma.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/mavijigejopiv.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/j0m6486lsjmsfh82krh1n1j38c/39039503413.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/91040731615.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160785d8d8bdbc---peweronub.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3f141bb760973cf2beb215fafcea6946/gazoroxufexolu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/4190982571.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addcaf18445---75188430540.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/26403047641.pdfIn PDF document text
    • http://peoplefoster.com/pliki/59001346806.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608483a20ac26---88459171106.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/53d52aca02b2e63c3ab817f59af541f2/89504477393.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/35183030816.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/kazejoforajiwowoluzota.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/85959006404.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/75435840129.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/rowozofoditewiluxolodepab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=periodicidad+del+manual+de+funcionesPDF 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_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10640 bytes
SHA-256: de31d8f4f9857af62188c614da2352a0aca3cf256af257fc3282e7e24dc7d396
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 18552 bytes
SHA-256: e40acf23774dafcc5f7b175b21fbd127c55d4349406ab2e492ed1bcbdb80a6f1

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