Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca27cab96f027ce…

MALICIOUS

PDF

80.0 KB Created: 2021-10-08 01:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 3c2021af2a43475cdd5a7eef6948242d SHA-1: 1f9841a58cd3da53c5f1e55defe918839af2bc9c SHA-256: aca27cab96f027ce81cb3280a6fda60494149810ad3b85ee7dd83f6fddabcf2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs are embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://wastran.ru/uplcv?utm_term=how+many+years+is+a+generation+today PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6b2262206---6012032670.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/paponerexobisovi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/37733998636.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/tejerofow.pdfIn PDF document text
    • http://ippon.lv/uploads/File/mebopelenapufemiv.pdfIn PDF document text
    • http://rapet.hu/files/20792349477.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/mifilalojebataxajuzil.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143ab3495f2d---57092046094.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9q56umltc6ibioei0rqeca63sj/rosenosugedosijore.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/46205266748.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/metanowafejusuniwediri.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/82157538121.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/gizimobudelode.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/fazimuxifotunisemokun.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161563e2553d92---66757380006.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/wunikexufuvekixurubaxajad.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/duvivivabukapumijafut.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/melosapuvuvadejiwetobezo.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/novuzegag.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/67527114358.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/70394733036.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/fukafowojomatizop.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/kilixodirokabo.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/vozusuwivuwopapuxosos.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d1r4bp0f19s0ujufjugn0aopjl/14287080104.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/66264920117.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_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 18556 bytes
SHA-256: 70f3ea44fa9589620c26a7385fcb58bc5544ceb0e7357773003bb95640438bf2
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10736 bytes
SHA-256: 39fa8c532e53819930b64f2cf035f048c3ddf275bc87d9d27267a4b94a0bde84
font_02_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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