Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acac64a06f3aee1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 00:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff8e9fbcbfb0e0ee337d1049bbaddc5e SHA-1: 9727dc1a4ad1064fb2cc57dd5253c8e9b1bf9dbc SHA-256: 2acac64a06f3aee16151941fee625a6585f6003ca25f860ae09aabeac73f899b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://avphunter.ro/ckfinder/userfiles/files/96562494803.pdf In PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/kaxej.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1559b7be---fosugipirupomero.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/343a1e57a8e96e2885b6d9bc22eeacc2/53899254948.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094724d7ca5e---gimejuruneseka.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843ef3eec4---lopojetawakujop.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jhjsta5si6tpdkvs93psnc94fn/sunifaviwonufukafudiline.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a4d0b4b5d8d090c40371390647ab6c51/luligasikitebi.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/25677388477.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/limiworexefofaxifurenod.pdfIn PDF document text
    • http://indecomavo.pl/inc/sekevimoneferabibozagamo.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/rovepezidaragunudab.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/eb37d7991003af1a2826fa72eb3d544c/vumilasukuwamowumekovipo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f740c929b---dolizumewopudiwukul.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8qmnassm1pumtv48v6jveh8266/16470404421.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/zuzelodawuwawigelazowo.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/10468240994.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/midine.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tojirofawijisowoxegiruma.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210604104834_NjQ5MzA2Mjg1Mw==.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xoxagomamototalubikisa.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vrvll1vf7kbhc6kbqirjjt341t/8689745622.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/sawisedokut.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4307eaa23---jatunifopik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+add+title+premiere+proPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 18320 bytes
SHA-256: 367e3d65c0562d21d2e23fb51217c2beffde8f8345f712214a901aaee79b5822
font_01_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 10360 bytes
SHA-256: b735c80b79f7b1afbcc201d62feaa12cd49808fa0cd9ca8a16a272f6d63c16f4