Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e991e1685e67d33…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 05:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc0f6e6f4450158abe52f09a14e0c2ab SHA-1: 858950bb7995279bfacfe221c8ee0b8b5137a50a SHA-256: 4e991e1685e67d33aad7d047c23a46d7dea64d05634ce56e77e2ba59161cda32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may be used to lure users to malicious sites, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://stalmost.pl/userfiles/file/ratiwivifaxevikogulaxaxi.pdf In PDF document text
    • http://onlytech-tunisie.com/userfiles/file/setovomazimagolimum.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/fatixuzeregawixuzod.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da78ea818e2---kuloxibegomuxavevagajanu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/lusirifonefivewekusokev.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/setebasupubedo.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wokosomex.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/66906707195.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098429106f09---48157812985.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/29794717733.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/vigijafogaratodowopajajem.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/c2aajlnbk877ra2g2qbhtnaqr8/87034605163.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rboi5674ebpltpjpn328grsf4q/90569321813.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc0fc405d---97602475358.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/13046581424.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/ledufowaf.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/visuwaw.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51889271f---48911897221.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec91a6a925---4100325033.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/96516253563.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a16292b03be---kijovimezuzakot.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a647a469852---gajasapunususegeputiwe.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/wugolematozozuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=abecedario+ruso+pdfPDF 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_off0000c676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC676 21944 bytes
SHA-256: f60810e87efec474d8e6df365e39f4d3ff7a4dc351ae3ad7dfc8df0a8a757986
font_01_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 10584 bytes
SHA-256: 30568dcde0209ab62aa08e1a5257009733a59460cc092a0255f7493e29102f24
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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