Malicious PDF — malware analysis report

Static analysis result for SHA-256 947c23fcd258591e…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 11:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 126d2a837ea47d3f5b0e80fad90ce69d SHA-1: 4c8cc8a638eb56d711a6ec9ea006c6ae7db94501 SHA-256: 947c23fcd258591e1f786127752fe9fcdd30ae5778ee0999c536404ca89b3399
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL targets strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609913e6c214d---72408555176.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093989267f5b---kofebogelitiza.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/rivufeg.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/76713788416.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/12108074526.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc4797db7---wulobumetinarazilub.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/jolujukizizumoboje.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/zadotimabapusatixo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0ff5dc1699ee61e3b79593e05f1df36a/pinazeromojitokoxu.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///simalufipowadafu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/pukotonaseg.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8da0cdca5---77786754951.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7bajhp44e0f69cebcrvj4679mh/78818712144.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wifovufokofusotibemi.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210804160018153.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210617_030152.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fovesaxawerezofo.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/vasofunazabofaxobapu.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/barimenoxokimikaza.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/42802644255.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vevetupiberuv.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210630071543.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/87748752529.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a7937a3dd6d2496cacda994c04b3b663/75198933865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=number+1+typographyPDF 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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 10672 bytes
SHA-256: c5d8f3d031908321f37d8198f5bc2472c816b31fe3094e342bc8b9e3c3fb701c
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 17216 bytes
SHA-256: c90165e4a632b02034dad81baa9e497ecbdd0e029affe29cea5f0042f43762f6
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1