Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1647754bdf467e…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8403d256cc3c1716e00aa76d21306990 SHA-1: f4f1d7614da9403ff993a1b0ea571d10469e6175 SHA-256: 7f1647754bdf467e514eb29af815bc677171455eedf4d2ea2c518904b94e134e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://condicionamentofisico.com/arquivos/file/46710548677.pdf
    • http://alpha-cp.com/userfiles/file/lodokowipefixonixipusixij.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/p5vlduv1jl5nqcvth9l2ijgo42/5123404448.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160794c04316f3---rorabiteborokimo.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c310a27bf---paforobomodizibig.pdf
    • http://mispuntossaga.com/campannas/file/27074145859.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/10722005711.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4dc6ad8f---16418416341.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a362882b4d5---73908662362.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608066eb81e17---24863719645.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/af005637bf3e779c9ab54c4a7f8d89bc/senof.pdf
    • http://kasargod.net/uploads/file/8648483304.pdf
    • https://akproauto.com/nbloom/fckuploads/file/lijuvagewibufaxed.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/985b7f13399b1d7fa7cfe4d90b56d965/bitako.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/15613734813.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/41035749482.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef43445bc---73151720943.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a52e0a37b1a---xugibuduwadudamaze.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fb44996b8e71e3d366b9ec5515c9eb2b/bijenejagibenelurari.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1b048b60a---bagotagufivomujolol.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/zivawegoxepoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=one+sided+test+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fb.bin
7ae7dc0922cb7a76d912f1082396c2dc96a233e5154d2e02ee7d9da81f620d74
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 17444 bytes
font_01_sfnt_off00010ecc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 16792 bytes
font_02_sfnt_off000126e3.bin
af61432d871f10ea5c9b53dd44f8ded88a7e0fdd3eb73f7d497e9edb03d58b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10460 bytes