Malicious PDF — malware analysis report

Static analysis result for SHA-256 6056bc9f65a653a1…

MALICIOUS

PDF

85.0 KB Created: 2021-07-16 16:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a149171559da817d65d155913f06a720 SHA-1: 5d750771988995444d21666509357f8e00ae61f3 SHA-256: 6056bc9f65a653a18ec631c9a4366cd3f5bca0ede319eb321de9ef33c4ee1631
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=how+to+get+gold+in+wow PDF link annotation
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e8878f8ac---rimigutovisolip.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/59918971820.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b811b13d29---weluzi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/fimibasosere.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/76277339079.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dc1b41f62---linoxiwoxopujoka.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/8765067877.pdfIn PDF document text
    • http://asustainable.com/global/file/31261328276.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/kefelo.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/78504163608.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160af03a54540c---vinekegorupowuzisufupaj.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/27440028212.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/ac442c749ebb2d8db5c793a023e187cb/94549151275.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/mpsc8a19443n5n3k99pmohud8p/11059213798.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3bb8d56f7---74663161552.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54db1dcc9---69360493545.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/mulubosodibapadinobaxebat.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dccc85b29---63618550313.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76c03d31a---xekiferufofotomex.pdfIn PDF document text
    • http://axwelindia.com/uploads/somikaworalovezozezamawo.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210707050403.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a17008e075a---85264706643.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_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10072 bytes
SHA-256: 680ad51cd2d198e85dfc2e67d6c66fe94930e2fa3a150aa3b1622c75ab20a8f6
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 17528 bytes
SHA-256: aa82d2be32ac249431dd97aa2b71d13e7b4249ebeafdac7dcc880cfe279be188

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