Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bbe176d7d8900f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-22 23:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d70d9de5b95acbae10de5ad447ec7ff1 SHA-1: 183b439dce9301a96c53c545a5eb1e8a099573c3 SHA-256: 57bbe176d7d8900f6cc77cdd0a90f7f4f35269a2093c7e4d14fa782e46c7dd70
196 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soundspace.eu/Upload/file/tivigekilexapekuxoxixo.pdf In PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/rukazuwetitubiza.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/monezotepidepokeminimo.pdfIn PDF document text
    • http://robedecreateur.com/img/files/solakemoxifovig.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/11/file/20210911_211200_116.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/9212667124.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fcuqbihhas78su4moo5pqgevi1/tofatovijesilowawe.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/96277451431.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/38873174277.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/vunusavate.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/35070083278.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/nadupaba.pdfIn PDF document text
    • http://pieseautocomenzi.ro/userfiles/file/70662125102.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210918_53B92C419ED170D9.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/wadaximiwi.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/sedegedifofuzufodumuke.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xevugevuvexinuxu.pdfIn PDF document text
    • http://identik.hu/editor_up/gemetolotuxizopozufev.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/disezonogirebaj.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e647a925a---84524359472.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109011003555581.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161476b72ea6c4---nimezasisexidemi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/89629b9752a88b5a1b9a36ab89dff618/wedilakuj.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/57837869729.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2478faa06ad81a6101d709e3dae572ed/semanesuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=winrar+plus+apkPDF 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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 17544 bytes
SHA-256: 7cec381e1777e23177cf61038b9cbfd7d36e938152add7820673afbe62742880
font_02_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10080 bytes
SHA-256: 2e019d45cc0fd74cdd3696ce8e3aede4413e903eba0c321422168b65c2fb60f3