Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05a5ccd3f04ee04…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 00:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c7a89fc8c783ad5f02b8f6d3eefd968 SHA-1: b4be191a5e9dde76b6250874f93a73e39bc623f9 SHA-256: f05a5ccd3f04ee049b375847191b2f78dd34f8f6c95265ad438a9660468aba59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nabsangram.com/userfiles/file/tagurej.pdf In PDF document text
    • http://www.urbanwaterways.info/files/65840058452.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xiwajopazijiduzuroralop.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/sorim.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/fabozelekoso.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a23677fa8---39454755096.pdfIn PDF document text
    • http://wernitznigg.at/files/23747643021.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca6eb5b676---votejigaxawuvarezenupizur.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/886152daf02e8d847b82736cab64c083/87044495622.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210604045708718500zl3r7l.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/mikososulis.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/voviv.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb3089a6b---pepibijan.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/jizedi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6e53949b05fe49159bf4a07eecb12685/85290970878.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/28518260350.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/11rtjg8chkemvj72p7tfr3foc0/75732107539.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/aathmh59ma8716cgk2nen7v01p/27692438721.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/nasefixafop.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9c79d221---42880573916.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/db0ae948bf1b0d0693676fc0c7568e34/kefidozexemenud.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4b5bb3a1---68821009232.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/47384795296.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a171e211---ronoxizuzulozimidowimanud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=small+claims+court+subpoenaPDF 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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10848 bytes
SHA-256: 03b3e33e172efe41a1ea70caf91f97a8f53313accb99f60b5e35fcc5635d45fb
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 17708 bytes
SHA-256: 432316f1590d408aa38253c1c97faba7b45963267802b4d3e6e4c5af40865bc6
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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