Malicious PDF — malware analysis report

Static analysis result for SHA-256 add25272ebc33010…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 16:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfaca746ac0312bc9e1893b6aa6e5fa6 SHA-1: 7f256f820a3e1c649410cec027e34fe62433272b SHA-256: add25272ebc33010359e0be5ad9b1ca83f5b5062eeb2139534d2fec0c4d91ec3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL analysis suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://numen-wow.com/userfiles/cloud/files/rajosofiwigudipivolidi.pdf In PDF document text
    • http://zartmobilia.com/userfiles/file/20210909074632.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/neziketixidopalok.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3621af854ff048c23b41cb431d77ab44/97321291978.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/82607495654.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/65341738773.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/jelugogimigemora.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/kisumenorufulibajo.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/jejeku.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/84618286703.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/87314861700.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/53538754691.pdfIn PDF document text
    • http://newcityhk.com/userfiles/nalufi.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/rolafurofikakovumug.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vuvokotutobalu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ca5ac22c---latevuzalepunix.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dubopeteborowolaro.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cb5c5d03---85295723141.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/jamituwigegumofamulofil.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xofuwulizibovafiwodejaz.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/41612315843.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nubilefedumowubudiw.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/66615836834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+hedge+knight+graphic+novel+pdfPDF link annotation
    • https://lapdonline.org/file/58651645058.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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 10852 bytes
SHA-256: 6c7f117805006234c5a6ed59cc6c4ac5788a9fa623f44c93f593fac4b7f2d6d8
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 17972 bytes
SHA-256: edd866c8416932c1302b3e8a6c285ee36476836c240ae6cac900d23c8f4863db