Malicious PDF — malware analysis report

Static analysis result for SHA-256 8589c37717272c04…

MALICIOUS

PDF

86.2 KB Created: 2021-08-09 16:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 152193f8914064c5b0510899df29d7bd SHA-1: f9e540b35430e85b97f5237e2fc136996e08ec5b SHA-256: 8589c37717272c04ebd40f80e248bc5185c215117f4d0b2c5f746db41190eda4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://drivescuolaguida.it/userfiles/files/54753975058.pdf In PDF document text
    • https://mygo.com/ckfinder/userfiles/files/93482701651.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/4553226062.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/lokul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d581a0471---90444804124.pdfIn PDF document text
    • https://bataretak.com/img/files/file/79364000919.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/79887545040.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/xopalibevapokitefik.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/liwuto.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/podowejamafojej.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/264b8c432dc307d281829d72edc5f756/6377320993.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/sebukoboxaletasufifurofi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161004af753f66---58545373598.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd1136da8---taxomolurixinoferusasarik.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/mevatesozafuweniduvodof.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fddb0c74139---32578884694.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/pdm4lhoqj4g9pbjqc93g7v51os/wusup.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/disolirimoboxisuzekaruwo.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/81473499252.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/47146317669.pdfIn PDF document text
    • http://naucseto.cz/storage/sibobemus.pdfIn PDF document text
    • https://signika.pl/Upload/file/47614105851.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/sunerixux.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/filuwevesafusem.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/28209529033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=magnesium+iodine+lewis+dot+structurePDF 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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 18252 bytes
SHA-256: 7766a7638e440e3ce16b38ed7028ff2801cb9ed6443708308d9dc9e1823bac2c
font_01_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10892 bytes
SHA-256: 86b4529ffbf4ca71308f02d0769081262bb4399f60263532dc084782682dd81c
font_02_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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