Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd7f5331395df4d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 23:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f0c753439c2d79dd1ff5b59daee569b SHA-1: 7d00f175ba04e79af7ea66b9d49ea3d6abe2408d SHA-256: 2fd7f5331395df4d0b46cec08cc9698164ca947112d68da0456f753848cfe779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using small PDFs for link farming on disposable hosting, often associated with SEO manipulation or redirecting users to malicious sites. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/80vhp0o17f6vbr2h84nk1vkca2/28544931606.pdf In PDF document text
    • http://geasit.it/userfiles/files/31721051894.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/50081387147.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/22981820469.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/82978286050.pdfIn PDF document text
    • http://klinok-saintp.ru/files/11089138833.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/paviwosunubop.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/19718723005.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/62530408662.pdfIn PDF document text
    • https://ahha.az/userfiles/file/bazutumunej.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/gotasabem.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/resoxavogutudolalomig.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2703850fa---6596860446.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/zimureruvakugoropubuj.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/9972700257.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/96057bb9a552b3e2bff1ed495241a914/73602604355.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8f8ccee67eedbce0f66af7ed320c4319/rakeno.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9a1b600b0---niguve.pdfIn PDF document text
    • http://rcot.by/pics/files/77352987602.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44b42bac46fbc2eab24de5a8528c181f/sewiguxaxovewusaru.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/57730726610.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/94713333759.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/kobegorodoropokivexe.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/69941356711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+meaning+of+koinoniaPDF 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_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 22008 bytes
SHA-256: f7e63ba733b19b7e93515307f8c90de5fa9b6010a78a5bdea54f27666cb5702c
font_02_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 10304 bytes
SHA-256: c228391446499a10bd816fd36db9b2d992394ee40cc44261f32902f6e6e4d44c

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