Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa41f9f81396f246…

MALICIOUS

PDF

119.0 KB Created: 2021-07-22 09:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b5c9d70a6c7156141e5333ca2cbb49d SHA-1: 280f7aa51e1dd73836ddf50e63b3334a33d716e0 SHA-256: aa41f9f81396f2466c815977f5a053087ca3fd329fdd12dd7380a48257826964
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, with several heuristics indicating compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://alpha-th.com/userfiles/file/xosud.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c719c22e5a3d075b3b8a341132a3fc84/83118435711.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/31542801506.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccdae2323---81850685317.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db07abb7f03---tojudumasikufukuzabuwib.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ov35lljk66amsppng0deabg2n/30714206382.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/juwijekuvigokiropidu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609de090038ca---28725237973.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b312bd1c704---42888185366.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277c106187---fuwamojurajowelep.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac6f2303a---zarukuwefuretumogijotaxum.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vdpmbkdb8v91d3l092c8g9tm4s/92412783007.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b127522c2e0---98872149460.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/11815505917.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/gukikemesanidoterowisamol.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wuxumarekitaxerazifibage.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/29174706606.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847503b2d1c---lixok.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3nr12vn4ui047fja8vuf69of2l/zawesasanirujenojaxaj.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/91199929264.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abd77a077af---potisavavizul.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/22811423131.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/jokubusugepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=braised+pork+with+ricePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 33244 bytes
SHA-256: bd231d951720fa0164167ce336194fd38918835ebee2b0c5fb39b09ae9fc8e7e
font_01_sfnt_off00016bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF8 18568 bytes
SHA-256: 4231fe5528a84e228da529b6fdbfaa541c96368c0f9f7b1e6dd0d71e0d52d4bf
font_02_sfnt_off00019c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B45C 10692 bytes
SHA-256: f9e9e90dc06a6aed441dc562e0b3d2ff14711fef67fbd7574977adf0f7041039

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