Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2072850e949a45…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 10:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72168cc1c3715672e9d86f583b036df0 SHA-1: 2ac277506b157c62c25412a558b11983a107adc3 SHA-256: 4f2072850e949a457373f49d0940af99e168ecd2d2f63b8894cfb55036c9e330
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cybernet-ap.com/UserFiles/File/47604699616.pdf In PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rulovomisu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/1438648595.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/jufija.pdfIn PDF document text
    • http://alkanboya.com/files/file///55500170375.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/62555471851.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196224117206.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/50127440642.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9db1ec3b---4868908361.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mikosijo.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/kufadilikexinewalujab.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdfIn PDF document text
    • https://virker-ikke.dk/files/jezene.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/208dcc46d450a9658f8286412dba9a52/29592130316.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/88017382816.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/82611173689.pdfIn PDF document text
    • http://hocomesun.com/upload/39573320112.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/8675310746.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/godirazi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bgm876oc1simv4ile8prmbbuvk/nedelokojufujix.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48787383600.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/rafivojogamav.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/23028061306.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210912065018.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/ribidumumozinigujobeve.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21282280968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=critical+ops+hack+aimbotPDF 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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 17168 bytes
SHA-256: 344621a77f0f53dd424538b1ff50cfb9c7b1d572fb2dc23740b7f47ab275a730
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 10668 bytes
SHA-256: d2924a38a65a37fe0c854f61ad8e23c816ef1423de39b391c412fe86c4a1db54