Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a16acd8681f2a81…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 18:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05097022e7256683fe13778d8bf911f0 SHA-1: 9eff8df037377d083ac6a8a71da6a02685db7ca8 SHA-256: 5a16acd8681f2a81649ed1b48a261587fc0fcea7240f5fc276bb19e343e7dddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm or hosted on compromised sites. The presence of these links suggests an attempt to redirect the user to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=snow+bros+3+apk PDF link annotation
    • https://xyoaa.org/sites/default/files/files/31911029090.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/bolojumajamedezunidadogi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/ribotawoxa.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/difupewisuroruwevalofikug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4abeafb79a0ef7ebded0747aeb2e80cc/wokujuwojojon.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/94133871999.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901163109.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/50571236324.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/kedariruxanebogilaj.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7c2e14d5---54680772960.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4a9c2eaf---94147934811.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/26324976501.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/xitevavonagudu.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/28396658525.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/dakekis.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/80837009259.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/84294379797.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/ferezukubemematelimowaza.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/84622063368.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/taduwunizu.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xiwasej.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tamebasulafafiwabizoteb.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/30265665890.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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 10440 bytes
SHA-256: 6afe390a53276b04cecb85f64cee0ec77d37478c8be416d4d76c05735da8d845
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 18552 bytes
SHA-256: 777ae7f5dd294d0a3be92335e7858261f50f9469645eb08efd134bcb9e12fe3a
font_02_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1