Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77f0e048b1f04f2…

MALICIOUS

PDF

83.8 KB Created: 2021-10-05 02:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: de52e307bd2fea2b4566789f5653e29c SHA-1: 7a94aa8443cae111ee6017a091575d85701d1eb9 SHA-256: b77f0e048b1f04f26c7c74261d7690a1093835c0c3a4f0ccaf08e6c7d2718ab4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://voziky-paletove.cz/mctree.cz/pictures/other/files/74012580598.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134262f5c52f---74184964216.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914060144.pdfIn PDF document text
    • http://spakimthi.com/upload/files/84124364418.pdfIn PDF document text
    • http://shopabrang.com/images/files/zijidasukobes.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nvikq572ga24mbi5cnfd2o22pn/vojirosejajitake.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/luvudakosotarukekavowen.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/92851967989.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/90009679073.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906075022580.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9dd98e2bad28769a2f7b7a51e1a90490/lamaviluvidawoka.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/64518310181.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/kujonurunogupafi.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/10428947533.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/savuradodiwigifeluzet.pdfIn PDF document text
    • http://unityproductions.com/upload/files/47472787042.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6141be34b5d62.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/monanerewumudovikujonotak.pdfIn PDF document text
    • http://balone.net/_upload/file///11073759726.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/35686033454.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xabebetowojul.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/fokotepapeguzolaforumoto.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/miravotexejuvi.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/gudanipuwekife.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/8777436666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=example+of+internal+criticism+in+historyPDF 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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 19828 bytes
SHA-256: 9913189b13079613c79cee93732dc59d6f910dbaa356f69e82aa4f870cdfbe61
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10944 bytes
SHA-256: 8d181e1a492e33888f315b59e65ecc456da662579e24654ec55e671170e80947
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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