Malicious PDF — malware analysis report

Static analysis result for SHA-256 12216075a3818199…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 09:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71ebc5bb7a896f1f41de69cc280948a3 SHA-1: 4523f61553d2e6cb7f9ccf8fa515c846137c14c2 SHA-256: 12216075a3818199dc6d85764b30b97ae27df199651a825aac3d5f9c492a1089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://morebricks.com/ckfinder/userfiles/files/besumitasakata.pdf In PDF document text
    • http://hoteldanang.com/uploads/images/files/fepajerovew.pdfIn PDF document text
    • http://anna-bel.com/app/webroot/files/userfiles/files/36785544988.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140737294c36---kafodorevulukag.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/24161266973.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16135601457681---93044364750.pdfIn PDF document text
    • https://invest.pl/userfiles/file/48663718924.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/gozokatu.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/jupiwakaxapesi.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/10168850451.pdfIn PDF document text
    • http://baoveantam.org/upload/files/84540574039.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431945a08ba---38087698223.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/75518667493.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/zumizedevefid.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/71906617039.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/37986302568.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5b0b5780cd44e1eb4d00fc70826125b5/kenoruxoxiworiguvu.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/12257148818.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/96713598946.pdfIn PDF document text
    • http://erpos.sk/data/files/rejol.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/bemore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=curry+pasta+salad+recipePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/20490475219.pdfIn PDF document text
    • 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_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 16904 bytes
SHA-256: 8312fb38395ae071f1e27a4abfa8d0aaf6b57d0c9de1d4f9ab565886da01bb22
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 10528 bytes
SHA-256: 12796c9db20a287646d9410e366b11d5f3b770a0fafabffab6991ed654f8d6c9