Malicious PDF — malware analysis report

Static analysis result for SHA-256 be56aea9df852c3b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 22:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7f44088ecb6d6b474ae2fafa0e1f17a SHA-1: 20c051c5e170c8acaa1ae0bedcbd7e6f051f99ba SHA-256: be56aea9df852c3b45c359ad3b302fa8526343139cf266ad95097b215ec313c2
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple heuristics indicating it's a link farm and a lure for remote support tools. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggest the intent is to trick the user into installing remote access software, likely for malicious purposes. No scripts were extracted, but the PDF structure itself likely facilitates the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://opakowania-loga.pl/zdjecia/fotki/file/nakeradus.pdf In PDF document text
    • http://studiotecniconuti.it/userfiles/files/fibal.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396cec049fb---zokinawitifonare.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210920_7A68D221747965CB.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/12752220585.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///vazegidazojenitonatabo.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/sezakezoxabojenum.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/13299922333.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/tudawoxagazolapumedem.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/13304206844.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24efe7322---55384725019.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/25193362792.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/98000548774.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/zoxofarokivaboganutinefu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/lozepugesudutadusewetuz.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/valufuwul.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/53917552212.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/75470518579.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/50241207582.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/41622433654.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/79540833132.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/sovazowawud.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6ebf8c5deac8176b93dc46099039d15/90600621329.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/zinomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=remote+access+software+for+mobile+phonesPDF 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_off0000b810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB810 17416 bytes
SHA-256: 1c0755b6b8bae842c4d2975efcc3c050c2a7e46e3024ecc16c9ccdb66ec8f1bf
font_01_sfnt_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 11016 bytes
SHA-256: 425d8af526f022b11fd82df79ad02c79b94e8083abef9aab181065d436425012
font_02_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.