Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bdfd34e724db4e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 10:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b284ca12e8d3814402e96df4cd0db1a7 SHA-1: 6e2e8f83004fce157de945e06a90a3bdf44d2dfb SHA-256: a9bdfd34e724db4e2235955916444018cf6ecebde4dcd14f2e58a230229e743e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=how+to+open+archive+in+messenger+app PDF link annotation
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/pobone.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/jines.pdfIn PDF document text
    • https://razredna-nastava.net/files/96157160348.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141757c7c575---bafizowakitobakode.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/susalusepigudewugasuna.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/85497082534.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/zovag.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/93531662247.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/mebukadibuwagawimudo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ea60a8d6---76875633983.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/pugapupu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/55288509709.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906170804392.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/33853932588.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/88049775968.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522875c4c6---buxufabakadulidubojejixig.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nenuvisidupewolukiwur.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/58941220260.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/daxabo.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/sibukidukomabiriberumod.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawivaravamukijeferelav.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/rirosagike.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210918_9EB91459079A0CBB.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/46097349787.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_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 10920 bytes
SHA-256: 5bd792a41f8107215757b79d4690caa8689fed2d679967f6f172cdc43f1c7eb2
font_01_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16772 bytes
SHA-256: de64bcf4655e46cb8b0e1bb5f7028d0e237c20342f425250a84fec2aa709d0c1