Malicious PDF — malware analysis report

Static analysis result for SHA-256 8401212aafc765d4…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 00:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a583e6aa396febd42bff6a2fa5705bb8 SHA-1: cdb7b24c06c34ccb2422ad17877ac4f10802f8f1 SHA-256: 8401212aafc765d492cc3f96481394664be4922cd9aba2978c17462e92352448
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress upload directories. These links likely serve as a mechanism to download and execute a second-stage payload, indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=picture+of+android+17
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e354c8e2f---benimanaposafop.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/mogipiwekavexizidodemiti.pdf
    • https://arabadvertise.com/userfiles/files/ronodatinef.pdf
    • https://pikhospital.com/ck_uploads/uploads/files/77187065556.pdf
    • http://yuanyoujie.vip/userfiles/file/lijoxomafufu.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/nifuseretebuziwuwe.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/42107224836.pdf
    • https://rais.bg/uploads/file/zutamexolujomi.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc1fc4183---80838039155.pdf
    • http://santabruna.cl/upload/file/dakukoda.pdf
    • http://gzcil.com/uploadfile/files/mimisapujilezafoteteloko.pdf
    • http://baugeraeteverleih.de/benutzerdateien/63644879239.pdf
    • https://caraudioshop.ro/mm/file/maxupobuxu.pdf
    • https://tannhatviet.vn/upload/files/99278928.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/g9op9q84gb0fkfg90f9ahf108q/vamokiz.pdf
    • http://werder-ritter.de/UserFiles/File/misurabasub.pdf
    • http://bekescsaba.varosom.hu/userfiles/files/95447697572.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/kiloziwibujozefuw.pdf
    • http://camelliafb.com/uploads/files/202109110033508339.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/93342812089.pdf
    • http://niszczeniewaw.pl/userfiles/file/puludipupisoremonuguki.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a1f82832---6659711165.pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/24501421393.pdf
    • https://mimpisiluman.com/contents/files/mepotoxafokifanijiz.pdf
    • http://fertilityupdates.com/userfiles/files/sigojukomifolidikevet.pdf
    • http://elpijisystem.com/file/bewetujimox.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae625d59217b53f39c8f17dfe4e4c3b5/sobumigipipezopox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb37.bin
1620d756db97895f5143232052fd903dfb9b319641b0248b276a4142005339f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 16580 bytes
font_01_sfnt_off0000e5fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 16792 bytes
font_02_sfnt_off0000fe14.bin
aa00c88b28dcbcd4f6ce4347d3d31603e6d2f2c25377f1faa9b121881ae9bf4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 10460 bytes

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