Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff22e40d331dd478…

MALICIOUS

PDF

96.1 KB Created: 2021-08-06 14:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50b6f89505e4baf68b99ec8b5175f3a9 SHA-1: bbce6255fac7f2e862e75d0616c256209569cf94 SHA-256: ff22e40d331dd478cbbd8f7a92deeb87de848d193d79cd5227f1441455ec1562
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. The primary IOC is the URL associated with a compromised WordPress upload, suggesting it may serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kudbjpeponfrkbfa8i5g0pi60o/femigasibipo.pdf In PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/8004812277.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/relofelogetexibovib.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/98661762984.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84dd98fca---mizavuvabagimisiladomi.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/29468498444.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4a4a8ec2d9693ab9a07c37bf335906e4/97512647228.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/58ea00c106df70e03d710b90ca32950a/53182443214.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071061959f---dijorogidoz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d7b3c1ab1314cc30b002a6b1ff74963c/57186520244.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/webodamumor.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/77607491398.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c966f5be---fubesisagexivone.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/56501123298.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b7b0bc54---dipaperasurujuwenifusira.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/49730217236.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sop8v4rjb1tuorudcfoogcjc7j/25450906644.pdfIn PDF document text
    • https://badrivishal.com/media/semopofavexedigesajot.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/vikurekizi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210726182602_1982207974.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a237cb1830---56674691895.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/33804044399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jeito+certo+de+usar+minoxidil+na+barbaPDF 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_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 10864 bytes
SHA-256: 1cc6829cceffeca2937681f104a7f718b4a22a840273b09f8fdf40e052b9deb8
font_01_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 20392 bytes
SHA-256: dbcdfd8811a6f1199d35b52cf6a8bfcfe8e8856cb500d2f87bf84f37152760d9
font_02_sfnt_off0001584b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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