Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8ffb3893fd9eda…

MALICIOUS

PDF

91.0 KB Created: 2021-06-30 00:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17fe8d2090749b9295ea095ab0042117 SHA-1: 70ae2d2c908932a24b65f1813a9ef5be7dc2b9af SHA-256: df8ffb3893fd9eda05dac9c8266bcf0ae02ab2a7106d867f723efbd0900bc7d2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple compromised websites and disposable hosting, suggesting an attempt to distribute further malware or phish for information. The presence of numerous external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://fotografoenricogiampieri.it/userfiles/files/wamuge.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9f56cb2f0d2a087f19afeab0cdbd2174/zutit.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607626a06edfc---gejidebos.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ribbet68gsd55is3afm2t6jck2/jopabopo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/979649e6594bce19afb0068d10ffeca6/gunemazozemen.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5dc8t1f8g17s6q9ueblo1p49d1/50557623967.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d288508f73---lozitedorimoju.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/janadifefosogut.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/gavega.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1902860c2d---tuzugotafaval.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/98702885237.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0477458f0---fozavajiwufabupugoka.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2d8d7cbe8---56218539144.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/2267208461.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/97745502720.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c68e7748e9---31397271188.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zudofirasew.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0c84c5a72f9efcd074f524258909a456/kafavelimufidisujo.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/jetanuwevadawi.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/2iji81oehomhcfg8e9rda1rh6b/52190335551.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/pekune.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/7734632786.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add2ca544d5---86467887559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=difference+in+2+stroke+and+4+strokePDF 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_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 10712 bytes
SHA-256: 15ab24081def4966c3886adcb7d11f6907856c8e61ee2aba38a70bd9f197b29d
font_01_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 17536 bytes
SHA-256: 256d185613a5189af07a30f5c536608d2808888e93baa52e7f6a4815c1deb9b2
font_02_sfnt_off000144f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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