Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e320527156389d7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 20:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 280750a931f99d93af8cb8086137cb79 SHA-1: 61cca36dd9c23af16d43169eb3f749c200727a42 SHA-256: 8e320527156389d7e28eeb195df0e542086481ec393875f1638c26bf6357354f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several heuristics indicate the presence of a link farm on disposable or compromised hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=anime+flash+games+unblocked PDF link annotation
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/34509280983.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56ae58be6---lemoferikebi.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/nurobit.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/kudajuso.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/gesitepofenewexabi.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/noxirizimel.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/dedadodogotos.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/75958818184.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/fidadejimeforepomotuzefi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/88195310461.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mexaderisolojibomixiso.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/48029650087.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6d6b60c5aeca4aaf27be733614e09463/99767763327.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/keziga.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/dafezatevudakezifubabupo.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/rakaduxopikewiwobev.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/81330354777.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/67843742675.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161304a629fa3f---degekimuwenim.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/kipajabipoxunuxodenobufo.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nazepamokokomak.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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 17436 bytes
SHA-256: 853eed007ff60c40102fe45efbc79bc4791e0949ebc9ab2df6683c61a414683c
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 11036 bytes
SHA-256: d6a145476930eee80d5e798ff18e52a7fa0a23b3e42a594dbd047c70239fc590