Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a349b0a24d40c2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 17:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3b1bfa7c2e3343023444073c3734481 SHA-1: c513554a4587e959bbd54bc343f4cb3e7300b263 SHA-256: 89a349b0a24d40c2ff2066529f9a8803788866954b48ef5725abaa18d6978240
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS upload directories, suggesting it's designed to lure users to malicious sites. The presence of a link farm on disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=pokemon+my+oldboy PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63e190579---vaxamon.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/38529018514.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xidixoredefulusupimav.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138789db122a---97398303741.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/dapojerasulawagurusu.pdfIn PDF document text
    • https://basisnomor.com/contents/files/zigewikajujaxirovi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/48414024495.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/3442099509.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/10b242c414b59bd763c7896c040fe442/xuxaxesu.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/76951035672.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d728a923e---futudufap.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/rotusoxotuvolowigarubiziw.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/83163259860.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/94934010096.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/vovibejafebonasize.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/vivepowubewedoravikegeta.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/79784527440.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/nekabumunukuvurovewe.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/8792548995.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7314d1473---rowinaneki.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/68228702743.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/53117953460.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/19691769633.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/es5nilgfapbaqaeag6jp4kfdqe/97470364384.pdfIn PDF document text
    • https://bak.vn/upload/files/pobidenuvekedosif.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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 17864 bytes
SHA-256: b196e0eb8d2174c3e5f94126701678e84af1be3e76de6fafd633ae273d4f8e5c
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 10136 bytes
SHA-256: dff98e93940e279c9715ca9e075511bd77844cfe3e1140b0fc6a01974abfd87a

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