Malicious PDF — malware analysis report

Static analysis result for SHA-256 a784546febbcc8a3…

MALICIOUS

PDF

88.9 KB Created: 2021-07-27 07:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a26cb8fb0ffb71c8d82d0acf579486e3 SHA-1: b34883b5e8c545c828917e92febd8a36d41e8132 SHA-256: a784546febbcc8a343c6c3b35af90cd680f81065c5839fd5ac0d6cf4549d48ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many links pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious. While no executable scripts were extracted, the structure and numerous external links suggest an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cwesp.biz/upload/file/nagonowep.pdf In PDF document text
    • http://velo.hu/UserFiles//file/lotepopalenizada.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/xuxosuximikeludo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d751c5279c---lanekowovegoloxojoluzewaj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6db5a7ebc3---tikatukefosife.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/27/banileji.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/mibipari.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6c2e4bf2df77ffe7ac4f8c1d0f5dd9c4/56310441573.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7d53d0bccc0325f5cc134716f32a0223/fisaretepoxexebuxi.pdfIn PDF document text
    • http://chromavials.com/d/files/nonapagosenipew.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b142aeb66478a8589ea08e20a71f0e82/donidivowenijevupameloxa.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/vipajiwo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c8e387069---rojizivazafozumok.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1623109044.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/togoxa.pdfIn PDF document text
    • http://berbun.com/user_img/file/tagil.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/95464cc970425c5b021a52e461a457bc/81302454822.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4ca8ae30b93361e09b080f829e1e58ea/ralimanuzodizagib.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pusaxuke.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/rupumeneg.pdfIn PDF document text
    • http://scriptonica.ru/files/files/rapuwibugupewupuvib.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/tedugitosix.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c1b66d0d068ca1654bd1cb66fccf1389/89352674010.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085bde3c2842---98540165911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cuentos+cortos+para+adolescentes+de+amorPDF 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_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 10716 bytes
SHA-256: e8a4631586f9bea95e124d97d030d01cdd3bad54e9f041bb126ca06499378d94
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 17316 bytes
SHA-256: c252d02ff282012f53709cd9e8e10b007223e4271f615427fd3b264599c7adbd
font_02_sfnt_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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