Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb7dd8ff9abfa8e…

MALICIOUS

PDF

95.2 KB Created: 2021-07-17 22:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46ce3cedde8dcbd91badb8cb04449f1b SHA-1: 59fb76e5abbca08f219bd9849fa686b0127c5d89 SHA-256: 4eb7dd8ff9abfa8ed7651207a6e22a659d0a358050b4ad043af212df4b93073c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://automsystem.com/UploadFile/file/20210617153102971.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609935fb8fec2---nimiweluseb.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085996319359---51301935475.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-22/20210622175219291019.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/de0754393642af48f04c38832b2948bf/fosuwolupi.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/68677247556.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/korepeligegudesatu.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/3676163511.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c9d9e5e790dfb48d5c8523460264ac1f/61779003102.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690fea7e75---bodikovanajobubazisalow.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a134719acaa5b8ddf6a34fec4ce19aa4/zelowuwinojekeduni.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/93497779642.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/feririgawedudezub.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f72c65c3---fotawumusamu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1dfc2d3e---63303888876.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fevogezubadevesur.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/59626340456.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0adbb1a2f6---35495384433.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zazovurikoboworuj.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/87009375294.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t65183iamtndoh9th01e4qe2lo/46304717336.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9di5s1o576jmi0geu7da5r262/kesol.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t93bklfi8ri61tqkgaotpn12os/xukow.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/13467719171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+golden+kite+the+silver+wind+answersPDF 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_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 17164 bytes
SHA-256: eb9e41044c3d2cd1e05013abbe9ba27ec27d9c6f4e5034a005cdac0c5b32b40a
font_01_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15702 10736 bytes
SHA-256: d075b9888cdf24f188f8cf15d887c4a53f5a45a06f4ba98b24ea03f6ac7958ed

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