Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30644c6ae8ba904…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 22:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e27fe9fb6f3297c1936b16eb6f9d005 SHA-1: ca1a0c086af215943ebd6d4de70c3e746c29abb0 SHA-256: d30644c6ae8ba9044d73116b828cf927a5954653948dab8fdc5929b3692da440
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms strongly supports its use in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=download+logo+esport+maker+apk PDF link annotation
    • http://boschvietnam.com/files/usersfiles/files/renumarotujun.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/20742386652.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136822759930---26714592371.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390e64092e9---panumuwonefitaju.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/milojimuwedikav.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sujisemupasi.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/kejafegukeromafa.pdfIn PDF document text
    • https://ka-base.no/images_content/file/vobodivijutidozelesukezur.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907062205.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fa2e9c4a18ecdcd0d4363813b904cc91/nupebixifo.pdfIn PDF document text
    • http://rayer.cn/d/files/14306551625.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109072118455951.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/monezurinot.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135c6e1b4b47---58956921380.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/fexiv.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/sojovixekewajixopiriduwa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf52301a9---fugivezodaze.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/joluwaki.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/fivojubukezivewivofavu.pdfIn PDF document text
    • http://alkanboya.com/files/file///26180571676.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/19211816592.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c25c9c77290d7b29f4a01b9c20e3c71f/92632303330.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tm9tt5qnjdtulkgnhq8a59p24q/xopekawilazovitakowilom.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/57065019948.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/wunokoxoboxidowuxax.pdfIn PDF document text
    • http://12shio5.com/contents/files/27189792833.pdfIn PDF document text
    • 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 17356 bytes
SHA-256: 64348f95559a953f39eb060051f71f0c7d61274a80169966b302788f773686ac
font_01_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 10820 bytes
SHA-256: 402f3ea7357bee42d673d24f56d25dee8ca9f570659df8f6cb5d2b07bd1ebaf8
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1