Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ce8908fb112bc0…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 14:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ecb0b81e8509ea9542b491f470608086 SHA-1: 6fd56d2893015bc48933a3defdbb33e8b629742b SHA-256: c3ce8908fb112bc0e4ac6cf1dd4c5d9e6908b263bf94ee7bc9c68b33b304040c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to compromised WordPress upload directories suggests an attempt to host and distribute malicious content or phishing pages. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/orusj3jbfed677dqghvkhr6lj5/14175410088.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c285b2ab9---26688398141.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a752f90b8ceed16f6b9ec3e304ef4550/zupagonezomivano.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/28917163135.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/kexusekug.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gadipageget.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/32497344545.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608be03052e0e---tunitukesezimidafiniwore.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca6541827---44760189070.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fda2ff7284667651a4cb6748c2a72ba6/wimozajalojodozazasoda.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ba7082bd8795179170b96b5ca52d02f0/84848161723.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3a81123ce19d14e46cff46bf2b6c0f73/lemepabenos.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a793dd383f4f54f7827eb69eab29aba/falasugaxodowuloxox.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d91c6e6ecb3---84158037842.pdfIn PDF document text
    • https://fallsplat.se/file/11044872697.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/cnjg5jthipoatqgjia8oqhd1q3/lisofejozidireta.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/180823322585.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7uqreuguprqsbkl10sn3g9dvn1/16192594109.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/vitonopavupezuvukomi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5cea997d99581664d8b5fdf1fd24af28/loseterudetiwokituxuxoxef.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/soxedorog.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/93727839459.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/31066122466.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2197bfd2773043473e41678898aca552/51763860699.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a273ccb5afb---91360253742.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/689dd11805c931dd444afc47081fd7d4/98622300212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=it+band+swellingPDF 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 10380 bytes
SHA-256: f21e4b2e8f328a477e5d551a66a7c6f39f7aaebb12e67fdb1298eead741c8d37
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 17664 bytes
SHA-256: 5d87f4bc8fda6a076a6057c342bb4fcfc2b57b2a37d33c0657eb6aac0e577618

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