Malicious PDF — malware analysis report

Static analysis result for SHA-256 123880577e2a2161…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 19:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 400539aac9db18249c80621f23e0fd07 SHA-1: 00bc34861b8081bcdcfad503b13780004c2b44a5 SHA-256: 123880577e2a2161b151f1ce46d47521cd2b59cfb8410cf89d45c70e3e9b3e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to malicious sites, aligning with spearphishing tactics.

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://ketchas.ru/uplcv?utm_term=world+conqueror+4+mod+apk+hack PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/92757904881aaaa52498d32b38880078/74189584381.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/31693235669.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tejobonelajofuvinemisa.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tefumubatuv.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/bipelexomavesuz.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d9889ee7---sasavezilib.pdfIn PDF document text
    • http://land89.com/ckupload/files/goxilovovinejutelu.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/tejozenulawesovosukus.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/77334190185.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/nujar.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/85290248780.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/35563315229.pdfIn PDF document text
    • https://petikdaun.com/contents/files/lebizetibibudexanaxu.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/rolebapazabiruwavinadonu.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/83654225864.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210917230101.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e363cfd93c2b38e036d4cff7b5e47a66/jagugulumonajofes.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/rotakiga.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/84618843416.pdfIn PDF document text
    • http://ijfbn.com/editor_up/55799818437.pdfIn PDF document text
    • https://ckmandarin.com/uploads/90798889570.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021092000471370554.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed69457407---34803392985.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/tifujavi.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_off0000b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 10832 bytes
SHA-256: 87a4f991c9cd1775bc5455b376d6ebe2e0a0423bb4ac08fa17fbacb51ed5e01c
font_01_sfnt_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 16520 bytes
SHA-256: 6a6523af53a1aac90a0a2b2de8a7965d847eac8fd03e96520490d1be0deefeb7

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