Malicious PDF — malware analysis report

Static analysis result for SHA-256 262bfa6a13709b70…

MALICIOUS

PDF

90.7 KB Created: 2021-07-13 21:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efd1134b034f1e0fff8b13e5913ad739 SHA-1: aa22447b7388928b34a4b9f628fa6e42f03145a9 SHA-256: 262bfa6a13709b703c50e5aa870e6f1cc8b16440729640a93761e2bc3a077656
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains an exploit. Heuristics reveal it functions as a link farm, with numerous URLs pointing to external PDF files hosted on potentially compromised websites. These links are likely used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607271a9f18cb---xitodo.pdf In PDF document text
    • http://asfalon.com/__files/file/zobomavatowete.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/77079424783.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/40883879320.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a4517c2e7---37254648627.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070977835cd4---79403542888.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/wesexabelazejowatazoke.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/18b8d34d42e5ed7415280d0fd6059fec/lenibedilo.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/89560502141.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f270233eec---saketasosokavunav.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/24853825393.pdfIn PDF document text
    • https://soechi.id/userfiles/file/rebobezejinusi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a57ca283000fd603c9ead08b329909a6/sevamizudexuvulisun.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/rexororejaxudefixevel.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/52914411418.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/67975801188.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ugda3cvp5vhlvndgkqs1odc2i5/16583315602.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/eb29d7e30928afeae939955113ec75d4/60055482113.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce30319c6be---66764868914.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/37959709200.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2c9db66a---devetivakavatatur.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106290551363688.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/vozelobezutisilov.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/5937882426.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f0d927d09---13185981931.pdfIn PDF document text
    • http://exima.kr/userData/board/file/nopuribabudal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=for+a+moment+meaningPDF 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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 16780 bytes
SHA-256: de5553c4ad6572df8628adaae0302770970000dfd8ced48e8a4e8f67cc75e7e9
font_02_sfnt_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001464d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464D 10216 bytes
SHA-256: da2eb879ff35ab7bd12d1e0e73c0916dc09a57c17763f91174a50c555533a746

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