Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84eb2a2037016ec…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 08:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9af7e1541bf775db5cfad3678b939da SHA-1: 1e2702cc3ddb7140db98d2d302a489e432a1085f SHA-256: f84eb2a2037016ec6c07e08a50288f1db59243a4d58decce82edf035d3225691
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests an attempt to direct users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://superplasticizer.cn/d/files/99333948750.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xujagagezapazi.pdfIn PDF document text
    • http://weymouthhighschool1960.com/clients/9/96/9679770cb43d952edac6f872f7aef95c/File/70596634043.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917f2ca5446---xugezakorer.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d023e88f6fe---jirifajijuxiborutin.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gafikovaferumabofu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5k82hvop4cbqn36j1joi97vgf4/26712995574.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/taxonasumezo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3438ad7c---nosadomutep.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/95601279053.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/jawefobexerodikexapa.pdfIn PDF document text
    • http://recrute.fr/files/files/1661097572.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/r89in0rst7jihlsll5asln2rt0/84741883858.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/29349377921.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kopuzexexinavegaliz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0877680b00ec0fd8a949d717e8ef4d6a/vesepikokav.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rb8484nen6c66nvu3eu7knd70d/9714307001.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9e1ed89a---ramisoxu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6934c4a322---96564118169.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/togiwosifovixiwezuj.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491bb6d066---90448802748.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9efc1ecdcd---47302058965.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052003165717.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/10692976984.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210802_175500.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/jasodeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=esl+library+grammar+practice+worksheets+first+conditional+negative+sentencesPDF 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_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 11548 bytes
SHA-256: 177b08532b3edd0e67c809c9c3b0a289f2a59621646610878b412cca1eba7b5f
font_02_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 17296 bytes
SHA-256: 259cd504d44a8082110ae0ac04431d8d85edfae279976339685b8ff769d36f45

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