Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc682fb06763dcc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 09:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b7ce809e550f20703b0a33c8d60659c SHA-1: c822902376e5efc3704df5cf3fc08752c35163f1 SHA-256: 1bc682fb06763dccefe437e59fc63e4613ef565d099134469e5a491e51b591ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple external URLs, including one hosted on a compromised WordPress site. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=white+tiger+wallpaper+for+android PDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161339722742c3---67529754113.pdfIn PDF document text
    • http://metapolar.hu/tmp/biwexejufow.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f1d11f79ce1b2ed004d757fd3e215ae3/xuraxifexizulegoz.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/vusob.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zilewunarakorifatozepomov.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/xerumapekikot.pdfIn PDF document text
    • https://trystsalonri.com/images/file/63876829831.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/zujino.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b62dca599e640f179a70a1e877456186/4163719041.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/20325434593.pdfIn PDF document text
    • http://dr-temt.ru/images/file/jatizexubujufen.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/61145029119.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/gogurejot.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/63042610220.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/pexapun.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/43169197602.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/80956289897.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/50020720141.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/80883902132.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///3000295729.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/tizudukuruwuzusemaxepopu.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/risukenu.pdfIn PDF document text
    • http://kesifveotesi.com/files/kagovixorataxagifigisi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2679f93f73df20c6f43383dcf0d45c91/38802876417.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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 10688 bytes
SHA-256: 125a7f3e0e6797606b6936ec6cbc86c356e953b12cf3012c7a1e94aa51a10676
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 20172 bytes
SHA-256: 2068c96079f7604dcf3e34f6de8d19187c57637aa5795a73c911f1a06cfb5047
font_02_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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