Malicious PDF — malware analysis report

Static analysis result for SHA-256 46316d1b075e8fc0…

MALICIOUS

PDF

86.9 KB Created: 2021-10-05 01:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 839ca564eddbd6311dfc6c8040ca723d SHA-1: 52c61ed51408ab8435f36e409d6c4c954de5db2e SHA-256: 46316d1b075e8fc054fa30fbdc36dae4396c45b9049e16bac23790d68c602e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress installations, indicating a potential distribution or phishing campaign. The PDF structure itself does not contain executable content but serves as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://oniceh.ru/uplcv?utm_term=waking+up+hot+and+thirsty PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/uj7gqirghu6ers4rdc1de4cnfh/15118739820.pdfIn PDF document text
    • https://kapefashion.com/files/files/vogilokidupoposetedin.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/3097400710.pdfIn PDF document text
    • https://cristalensi.com/public/File/subefubilosi.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/17869431632.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/59981857378.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/86168320430.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wutotikusumaxuderiduxodol.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/dogunix.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/21074408491.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/6349952459.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/12049243562.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/situzipaliletunusepo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/277ef3a62611251a1c2e3d013e3cf911/vujejuta.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/20124648942.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/24926969332.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614516201bcc7---zegerupubaj.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/nozibutive.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pevuzofexoginubawake.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/89472340382.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc816e63dd---rugonerekitakawunexe.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tumigevofar.pdfIn PDF document text
    • http://sswjeans.com/files/pizoxagabasisugekivov.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7c0ebf19---42039949576.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/kafedunisubozebofonixo.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/75951038112.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/tifejagitigesukotusi.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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 19720 bytes
SHA-256: ac764b6fdd658ad41ec0d165bb6baa26f9a75256ce8324eb9aac55a5e18246f3
font_01_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 10792 bytes
SHA-256: b4a2d3530ddfb7a9de69594041a85d537a94280f44c34871b5baeeacd88a37aa
font_02_sfnt_off0001358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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