Malicious PDF — malware analysis report

Static analysis result for SHA-256 a135794aafd2774f…

MALICIOUS

PDF

118.4 KB Created: 2021-06-28 02:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 95c62eb5184a92d6f949f59889c1b553 SHA-1: e758ed218f5c7378aaa35ea2099a391fd373fd66 SHA-256: a135794aafd2774f350f78b0bf9eaf6085ce9be96daa7ab037488b5b3ac3b62e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate a clear intent to redirect users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eacb47279---zaviwijadakijaxowovemo.pdf In PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9569bd669---56781114433.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/05/files/210529145735.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/29850021928.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3uu38njpk648bpqm1tosfdni13/midajolebikuxe.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/37585948783.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/ziluxidiwalupavodu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740920c8eb0---kufupofu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61179b6e5a---jemusuwenegi.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/lagetijotud.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/jipasorofalenafajibamule.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///77778403655.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/9e67050be01d82ba21417a997096e1d2/69112928042.pdfIn PDF document text
    • https://arerp.kr/data/file///30429114012.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484c33cc6f---57922902487.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0c7d75e7---21852174444.pdfIn PDF document text
    • https://baongochoa.com/upload/file/bipebenim.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/69oa6gn42hu3elsgv2t69imjes/95935335665.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/77118632647.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/47457636673.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/49177839673.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820252ed83b---dusikiguvadopu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fb7747219---xedazobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=king%27s+seafood+valley+fairPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12710 10636 bytes
SHA-256: 8a847da027d8ca37f501355c1bb8e2c89caad59fb7ed24d3cfd5eef66661c97e
font_02_sfnt_off00013f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F52 30096 bytes
SHA-256: 8d9ec796917b0a9ba96285105bee37ea9e01d49eead9ecc0da5127e7bf48f48f
font_03_sfnt_off0001969a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1969A 19172 bytes
SHA-256: 65e8b7fe5ecdbfbf395fff90097a57f95e5c97a70485421d057559f371f60870

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