Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88079b9d71210d0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 15:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c91aaa5e4f0b59a8e3c452f6b309fb3e SHA-1: ad8dcf1f759fe30b96f21fc62c55931612e37aee SHA-256: e88079b9d71210d01c2182b4058c5d0c159a88cf0556c4a287db4143ef026ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=3+similarities+between+mitosis+and+meiosis PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/18b74fbf3ec36ddf0efce709f5309dd3/58216439011.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8f7fcdee2d759572c9bf750fc73c9318/sodisoru.pdfIn PDF document text
    • http://krzeptowski.pl/file/dedevigakudoregij.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16128d902bcd00---48878232318.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/6797591415.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa103943da---55688210022.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ad91777f---24025304743.pdfIn PDF document text
    • https://luminex.pl/upload/file/75032150225.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/87b4249482f867b0070f15a14decc1a7/naxifawulim.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/20b36546ba3a4a188b4c9fd4e41a5749/72666058016.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/savoradibokixajetejug.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160743e555d829---ruselimegipapeko.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/mitavidotudewomuvele.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/30120095260.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/64209b975031cf09d2c6c53af92ab3b3/73718514462.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/zinuju.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/lufiwekepug.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/10345146357.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/roritijuremisotufavu.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/nojitifegozezadadirizo.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/xiwigimijiremepikujitij.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d856f8b7---feriguriso.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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 17272 bytes
SHA-256: 0792e93ab355faf64c9987e80a7140b0ca11afa9a875eb80517165ac43a84058
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10712 bytes
SHA-256: 8d65645433d820d90f200e4c37cf0d2e47a6ef369df8cad847fc63c6d1ec6085
font_02_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.