Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5beb3b749dcac8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 14:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7819fe13a05aaa718a7d3aa0dd736443 SHA-1: 458e2b397d06b143cdd3afec67cbfa941390eb03 SHA-256: cd5beb3b749dcac8c807addbb422ce0ef69a63fab5e05aa267c05f10a7c30736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mrthl6p7vpet637k3hjc67jbe3/38628650901.pdf In PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/pupumufegibuzolezup.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607405d7d45ae---58090339706.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eead1c1e4---sebexofav.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/55171306537.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdfecd6bd0---lexuk.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/9851675735.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7d26f62d03af9985a389cfcbb53dce7c/38912142701.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/24692988169.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/makefureworinivikudi.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/zajupasiduborivegixuwigu.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/64525486201.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6242b09f1b---numufupavowedon.pdfIn PDF document text
    • http://bronia.org/userfiles/file/kofubizadiwizelin.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/78258611559.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ofm7hqi4s3jg154lia150i51cr/nofikorisaxoxisenanuvi.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/72585dfe933f7cf99bba2d23092f9ddf/kanutebitawuvat.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/buwipimusevi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c12385cd42a---40994361423.pdfIn PDF document text
    • http://mega.kz/media/upload/files/bofubesemovolosovu.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/99475015585.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/sademaxogikew.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f4650dc91---kavemevuwipigo.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/kosabolilo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/41bc4c05cdb5c406f807b1cc73b430c2/pabaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=south+western+railway+route+map+pdfPDF 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_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 17500 bytes
SHA-256: 0830e0375007c876577b55a2649da7103ec8fbc24a699765b1ad8d7940c9aff2
font_01_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 11140 bytes
SHA-256: 99d30081c8c470a89029b42ed2f477a10e73cf87044c0e470fe6410799103f3d
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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