Malicious PDF — malware analysis report

Static analysis result for SHA-256 0237aaac5fc973c1…

MALICIOUS

PDF

149.5 KB Created: 2021-08-22 02:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dde11510d617c2245d3394cb1f87fad SHA-1: ac982dbe48c8a69ec9c2e6fc8307dab9f09e3947 SHA-256: 0237aaac5fc973c154bab00fefe3b4a79b7580b5ebfe1b7e6cad7e774bdc0c08
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, pointing to numerous domains, many of which appear to be disposable or compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

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 http://bliksis.ru/userfiles/file/84446684057.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nupejitele.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/et8jv7and815sss7nm1pn14qlj/tenexinaberakitomabavute.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///25282333956.pdfIn PDF document text
    • https://bak.vn/upload/files/34629871511.pdfIn PDF document text
    • https://coil.hk/upload/files/85650605264.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b038a81e20---34094207321.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92dfc62337---85765046009.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b93a664ca877c0c7d74e36e59d8aea18/vabamigebijovo.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tusegowalaz.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gonuxepisibik.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083442915877---tukupuvip.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10f1223a2b---79891395455.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xubevix.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/tesuwowiluf.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/fiwazamenonixu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc23870b75---zalekumuxaniguwinuledu.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/14973166641.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/xibitokedotezaludutigab.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/238gci3k4q7buocjpa53tq7qo7/loxulaxebagefutuwexu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xezojumubakaseriwev.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d1c70f999145527246320a16c2118a6/zetem.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/xapedujorokudowamelixesi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eu35si1s4lggvp2tnmead9m1v8/8008854139.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/melibes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chapter+3+test+form+2c+algebra+2+answer+keyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B727 11588 bytes
SHA-256: e823766d28737cb064cf98b2fc968fa2dea5e8a3c96c87f682b1c42397c7309e
font_01_sfnt_off0001d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D284 21108 bytes
SHA-256: 6a7a4ec9ee5e8f5ba1ca9a56b481f53f50eadb29b7c400af9bee07f7caa61b90
font_02_sfnt_off000208f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208F2 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00021e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E1E 3556 bytes
SHA-256: 515bb6f89038702a705f5a202bfc3235889d943adc0a70da65408c932f6af08c
font_04_sfnt_off00022c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.