Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc5db0c20a66c03…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 08:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e7264e8e3128360a7dd05e7caab7cbb SHA-1: 11481f7deb7e333bf01957f7b15f5113f650a9f6 SHA-256: 2dc5db0c20a66c03d9d4af932a454f8beb8e3acb5b60380450c2fbada2aa25ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. These link farms are designed to obscure the ultimate destination, which is likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=play+store+download+in+laptop+windows+7 PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dedb6da6---bujejesawunoxamodu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613afea00d72e---desoxelud.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/39130778422.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/76192613523.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/rimoduvemozuwub.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/vavuk.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/zamupobu.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/49353938025.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/3338306773.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/9140538455.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/firug.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913085959.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/35506218991.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/85991624297.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/pirure.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce6807431dd3b8c0ec251d0b46e2a514/sudijopugesunukabel.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6a49c13a---61602245756.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/85300201802.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/luxuxolexekawigegowixul.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210910_F00692BDCE44E234.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/82014268451.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/megeserasutidilag.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/wonutukikizetozigoseb.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_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 18096 bytes
SHA-256: 12c1bd69e609b0b1c79125de3c9ca41ca8531a21352d73a1669710ceab6bb010
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 10636 bytes
SHA-256: 3a4a73ffc39f3bec1d1d5c47211ed15b1768bdb08f91a62362daf5492084cb40
font_02_sfnt_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1