Malicious PDF — malware analysis report

Static analysis result for SHA-256 1141aa5b723429a2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 18:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 72b6a5deee570342b27bfcd96b51000c SHA-1: 3b191c809029091cefb50f50ba2364893b63b9d9 SHA-256: 1141aa5b723429a2d692aef3ac43e75fa2566e6b9ef1d2f103fb781db8a68ca4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to PDF files on various domains, supports the conclusion that this document is designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://njshore.drinkpoint.com/uploads/files/molegemixupurapel.pdf In PDF document text
    • http://kadh.kr/bobod/upload/file/bokunukopawumagapebomaw.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/78250009673.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/nifuma.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ao38jcnio496vk896g6c5j0n1j/vowiwexuv.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/papanix.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93352499028.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/68209810727.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/56162197021.pdfIn PDF document text
    • https://icbacademy.com/upload/files/60964961515.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/13720108247.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/37042733529.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vixudoziletituvedoparo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/56696207877.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/rexujasaguwef.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/86986621025.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011136047618.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26d277e52---7107070737.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/19541664292.pdfIn PDF document text
    • https://el-tall.pl/pics/file/55263480902.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/mokigemefi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c004bc50d6---nubidosowuvoxuwodukotisuj.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/jekogovapes.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/18754264750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=m3u+android+appPDF 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 10208 bytes
SHA-256: e6e9fda3d7de7ded98ec50b6eead5c97390850ae427ddd11117335282de502b4
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 18280 bytes
SHA-256: ed393a78187ef95ebd49c771d19b277cb16d039fe8d3c37d26e257a6f7f67265
font_02_sfnt_off00012e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1