Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5c7cd66d7809fe…

MALICIOUS

PDF

85.5 KB Created: 2021-08-23 13:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58ac6c0bc48ebb0bc7cef868a08716b3 SHA-1: 5c6f7d7b0ad73748f37bfb92d4d1374d0f43db50 SHA-256: 6d5c7cd66d7809fe6827eff20a4379bf82a581f3797cd08a7d14cc673668b875
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are hosted on a mix of disposable and potentially compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://www.anieliasfx.com/uploads/textareas/file/jitivamodizepos.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2956f4b71156b0bc0471fd3cce85c53f/15090937072.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/wagovowanufi.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/lffs2qq5b3qce201lmsdct7l34/nedejunosatolezubigo.pdfIn PDF document text
    • https://premium-house.uz/images/file/16475765213.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/dirusokumetoja.pdfIn PDF document text
    • http://nktrading.qa/file/files/4706619129.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec1608d2d---texudo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/puromidatowode.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd9e64106---19197711908.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lr7qcof2teicgcnhoq0e2ugk8/kajonevosagesofobaso.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/seger.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/11463478844.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5f92a879---zamotipanowujivoromoron.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/xujazarujuxenulomutexima.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07199efcb3---judapu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bee6ed87a57d99ce56a222db3789718b/vujov.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/jatakaxeminaz.pdfIn PDF document text
    • https://tappowine.com/file/suxotigetipesuzu.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/62683833586.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1ca2cedeec7e542bfc2eefd6bd5031d2/kagipujo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6bd07ec185f55c45c9bb7852f63d7d54/84826850938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+unadopt+yourselfPDF 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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 17464 bytes
SHA-256: d0a77e01ebaa0e5cc64689c984e4bb5cfec228b5b5309f7813833e784d41aba6
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 10644 bytes
SHA-256: 5a2007ad5357680306ca0c38d1558a674960ec3e99c1c6ba77e9b3d6431d8ca3
font_02_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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