Malicious PDF — malware analysis report

Static analysis result for SHA-256 4624338f18bbe8e3…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 18:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5003c46b43cf67b7f28ac8b0c77a969e SHA-1: 99f9ed31665c05fbf2b7701bf9974c6d39907086 SHA-256: 4624338f18bbe8e32a286fe08ac54446ad9fcdeb73dc908547e3bd1fc1922e9e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://red-adlay.com/upload/files/wejatenomalef.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6104g20nu1u7lst3kej0adgk95/simikosevawugiz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qav488ae5l9h33e08bjqkgftrc/85989991769.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/rigodazejisaxujezelo.pdfIn PDF document text
    • https://ijpdua.com/contents//files/87494019695.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf97c907df3---75940849813.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/24147647605.pdfIn PDF document text
    • http://crediramasrl.it/public/file/26912607577.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/b48e34bbfd7462fe7300f0d9bc963526/nogajegugolewexurukovibo.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67697736412.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1e106229bc2a728253ace65d6b6b856c/98387282824.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ecc29de473052fc53ab573f8de2aae31/13116619536.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/707ad4e5c962751a9eb4b2176b5bc493/xibasazazojirakozuxik.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/oknsjdqgk7mu9edkojldja2cc2/xuxigupevoluxelokelub.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071608b6e315---80127135844.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d7c3f11ea---gadafevoxi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160736f633b60f---4398988676.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9d491381a7aa1d07ca3ec09e438e856e/79516838062.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/81699282917.pdfIn PDF document text
    • https://onlinendttraining.net/files/79840846988.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3pu76ta4l3bk36l0e4dpvjr725/59777453358.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/tefixibos.pdfIn PDF document text
    • http://cy2hand.com/userfiles/poraxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+bride+test+reviewPDF 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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 17588 bytes
SHA-256: 6b392e653b8e19ea6b2e830a1a955ef0961849e1caab3a57329196c394f446a1
font_01_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 10168 bytes
SHA-256: d07ed5d4623f9b8c924794d52a1c58ebd3ef1237ef3e8043e919ecb5b7db1c50
font_02_sfnt_off0001350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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