Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc76cfef13dc6b1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 09:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51048d1c5ba40e421a561e6d4215dfce SHA-1: 6db0f33c28bc0a4f785783fec29236fdafe37e78 SHA-256: 9fc76cfef13dc6b182b45f6babbdba9a1bbed791f0aa295e79ac59af5ff238a4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df75a5ba8---99955379882.pdf In PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210717074930.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/pejuzu.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/46844534068.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/negeguxokogipadezojowapu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0663da32d---6088943339.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/sifidajumagawemibi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077710136447---58400103017.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/46146752292.pdfIn PDF document text
    • https://pratham.one/file/babawuwurusexiruj.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/dofajemiwuxanejiwomaf.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/57640915750.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/wisupigetov.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f68ac45a124744b6635dc237578f75f9/77216883302.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f79a8364a---31259574671.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5f0a0351---70679021937.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rikasijesufinat.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be8e73b9d2---bazawadikejupada.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/libirekafutel.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077213a637fe---15594017535.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xubakejanovanir.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/59760616780.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210815_769EA4E5AFEAE5B5.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/votijiv.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/37001693675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=temperature+and+enzyme+activity+worksheet+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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 11216 bytes
SHA-256: 838902f541526ef9adae2dc96e4228651d32179edc9b9b178679bf211cb8821e
font_01_sfnt_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 14824 bytes
SHA-256: 24bd7797471c5946cda91db3a294ade97a9749f6f51dabe38183f05928fc1185
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.