Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbe12dd76859349…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 10:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87ad824b633589a045cc2d614b529dcd SHA-1: 42cfc0ef688b92719816f392f636e9a11f650c85 SHA-256: fdbe12dd768593495023d18a8888f66419a5b45357359452458af9a46e8d3437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the structure of the PDF suggest it's part of a link farm designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2cb78e4f5150e4461d6ee75a48d3de73/zeneropukojebatuwof.pdf In PDF document text
    • http://cuatudongbinhduong.net/uploads/files/89097009506.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/835494fefdbdeafc197d23886f226ce1/pidusesigide.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085259c595dc---ravej.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/85971212256.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/48345313239.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070976776b70---giwelovekazuzamibef.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/gikujotorerozejip.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e08838d6c---zobim.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/54823332376.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3lv5jleueeiaoqm214tib99u1k/73336026603.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec8d6a7cb---relibekopekel.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/maxenafopeviwovipewel.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/499062d530be1c7fb2d35573e0ecc3d0/13711693259.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/744a6891f656a19cd8ee6dd870aca431/55581055719.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/46306780fd8a2c765f25797c0c56f6a0/jovegabadipukaxegulus.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a997ac44---punalewa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c509f3fa2---68008524846.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2d979cd6b24be1feb14ac175f26d9a13/kobusupofibol.pdfIn PDF document text
    • http://atek-ent.com/upload/file/11704834996.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/18754574693.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/79c2f3d758caa8486913c259d847456b/lunimesotirezixa.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/82055664351.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/313f7d4fb82aced3f1474b393272e5b6/vogukekekejaronibizimuki.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/losarukovufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sporotrichosis+in+catsPDF 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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 10368 bytes
SHA-256: c579dc13dd238243aa3384f40cda1e34e29d813e50c02822fae0e8a52b6a5541
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 17076 bytes
SHA-256: 999014d41eca56b924011e0586c09bc12841514cd6195c10324af17fe28a641c
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1