Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b9e2b1dc9a86f5…

MALICIOUS

PDF

95.6 KB Created: 2021-08-13 04:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57f3f667faaa99848f2beb3bca200c18 SHA-1: 00057ef2a54885c2a6b5a179539b7dde6fed5a0b SHA-256: 30b9e2b1dc9a86f5734425f8502be3db1f434b0be8a96a220fe9ee5f690d7cf9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://ahreco.com/uploads/news_file/4753887779.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jaecs08r05ms2bisji34usg558/pugesugitabisawupumox.pdfIn PDF document text
    • https://vestol.bg/files/file/46532711986.pdfIn PDF document text
    • https://longhoang.vn/upload/files/mofusatopivis.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/94062871961.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a190a82eb8aef97dc7427ae13edcd68b/22480903714.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/88216833641.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/89921962229.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7aea8044e---jubeluraxevubob.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/karibagexoviritanisineze.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xasijutawa.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/mawurezevi.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/59499592382.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/zitasutetapim.pdfIn PDF document text
    • http://gtshotel.it/images/file/tozedokoviv.pdfIn PDF document text
    • http://wamer.org/userfiles/file/38219480836.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081007014273499.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/49488684584.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/takusi.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021072605024496.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b15e21ab57f4798a9d390a9e2bd4da57/88116092655.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ad49dd21bfcca38114b2afbbc5d12d67/ruxopewava.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/58058016674.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/458fhnhrhheduqs92k9271vkb6/visokitorerebugakepagu.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/cbe61e7a30fcc942a35f7f908e5a5ce0/44404139372.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/powolalisiduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dash+mini+waffle+maker+recipe+book+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 17972 bytes
SHA-256: 0682ab06bc51e2586900027aed8d828c17091f20c977fd227f936e0152ed199a
font_01_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_02_sfnt_off00013ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000154e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E2 11108 bytes
SHA-256: 829f955de8c8ae8d2144838a8b6732cf72aadc129a71c1d2ba3f57e4949641a3

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