Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c02e1887fdd5f78…

MALICIOUS

PDF

88.7 KB Created: 2021-08-21 03:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 17a2fe9b1867d35a0a8ee0687caaf822 SHA-1: 965625d4e32dee61b00e2a28916e8fd070b0e5d2 SHA-256: 6c02e1887fdd5f789d7a4c094d2b5c63fec8382994fbea9ca935a453cac31fa9
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting it functions as a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://machulski.com/public/file/koxusomil.pdf In PDF document text
    • http://siciny.pl/userfiles/file/80342075438.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/df366a0920e42babed51a154045c6b75/polufujimuwoven.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/92338527216.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/pexivuwajivepejinegaraxu.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/fejolokurafijotekij.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hvr04l0etjupjtsfjhcsfbr9o0/80516591720.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/telimepuxudowa.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086597d12e65---vevebidowu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/15302015509.pdfIn PDF document text
    • http://sjanzee.nl/file/kosariti.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/8p2tpm6p2n0vb05q71pt0gbtto/medat.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512035727548641.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/jevevaterorarafekiwenu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/20140510318.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607887c5947b0---98480430141.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/niwedibapowamozapud.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/virekejabopixurepepewuw.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83b42bcc3---61051989911.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/501acqlk6qcpvbc68quipa1lvf/3420401336.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bb98e08dd5775bf8a65fb5e5ab0e3505/sujaboserejotakojufixuse.pdfIn PDF document text
    • https://andrejc.si/files/file/26801322129.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/jimozeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+does+interpet+green+away+take+to+workPDF 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_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 17900 bytes
SHA-256: 5a93cc3d72e716ca4eae5ade691e8629f54f5c978766c77409d025368efb76fc
font_01_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 10852 bytes
SHA-256: 2df287040fe2c15da14629a82060b6a93d84540ee134c05670043c72989fe438
font_02_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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