Malicious PDF — malware analysis report

Static analysis result for SHA-256 915a8f788b3efabc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 02:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cc548609ceb629cf4f227eb63a51b90 SHA-1: 601db542acbee291fec0d141dbf7d83b5aafc603 SHA-256: 915a8f788b3efabc1dfbfbedd1236591f1f8cae0000f1e0756d51ee3f726470e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://nawaress.com/webroot/js/ckfinder/userfiles/files/javeg.pdf In PDF document text
    • http://grafichesirio.com/userfiles/files/wegoxupurakepopa.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109012302418774.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/kepofifafi.pdfIn PDF document text
    • https://digireg.gr/upload/vusade.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613765dc13467---vubokosodupubidifu.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210908_180242.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/vafusod.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/tevefubutizoxifex.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/moropa.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/gubox.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161337b065ebd0---penapixotupu.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/fepijusuxetajodemigosuf.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/bigazopowuxo.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/89329861512.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/93305194523.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f15700373964b4c09518930479c5f6f7/sojopimoban.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/90673549237.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/gekuwonadudebolipaveba.pdfIn PDF document text
    • http://eventaipei.com/upload/files/74392125481.pdfIn PDF document text
    • https://breedlife.com/upload/files/kirutudumomotos.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/womadapizotojukudowot.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/87028736725.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/fetidijomag.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wanelafamiviwipal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+beginners+guidePDF 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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 17952 bytes
SHA-256: 1cdf35eaf81be973b9ad32b9b8e0398172f132039f339c7f074a3e933cdc9f23
font_01_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 10336 bytes
SHA-256: d88a4809f5526ce5707df37ef8d67fd39f1a8b3542ea260bd490167e0157e887
font_02_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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