Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3358c8de52b2a…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 05:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ddb40761cac4101af06382fe16501c6a SHA-1: 3c308b3f0a3279f6ba7d5e39c8b371bfefbae2da SHA-256: a2e3358c8de52b2a7b7605c0b5226edf27c768c28aca1f520bfe91d7fd39d0d7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://xn--49s538bo8ux8c.net/userfiles/file/suwumoleninajodu.pdf In PDF document text
    • http://abwessex.com/uploads/files/zulufifokeb.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/miwaritixinaxapotazefilu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/59037109797.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nerapixubibimafotiwidepa.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/60e1f02737b67ff2af0d5605b02a6208/13108295793.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/76652379561.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/62117c0b428a338a1c99c5191eb0ed0e/lamajupomajum.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc675c42d---70587470095.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60024786556.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ebf00c75dfd93209cdbf656c44e4aece/24603131730.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4f39113e6a62eed4964017f2191f5384/81675220919.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e5956455a08a584d61fd1a42d3e8679d/26832976337.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948636410ba---21530254699.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4fc0c16e---dagonasofanogatusunazegug.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/27577168575.pdfIn PDF document text
    • http://arslanemlak.come/file/13171512980.pdfIn PDF document text
    • http://limoride.net/gallery/file/sodedumagepevoloziposuk.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40f6f1d95---59393063252.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/bapexobukawuraxifowugiko.pdfIn PDF document text
    • https://airshow-bg.com/file/jisazefonafinenege.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a697451d4ce---vowakil.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9d6c12e3c662e19bb3b31ae4b21df302/89128868746.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/tojipukomi.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210704063037.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/56189158123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=good+traits+that+start+with+ePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 16516 bytes
SHA-256: 3aa65ebf49b85e858ab8a8d047976007980bfc00b16b2a8594eea35fca0ba65f
font_01_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 10320 bytes
SHA-256: f606156fdb28758e48fee3095cbb96e823359df20ef0665ec4ca71897742ca84