Malicious PDF — malware analysis report

Static analysis result for SHA-256 2751e6a00e663e12…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 20:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a71b3c5522d58881a73dcbcc0597b01a SHA-1: 55cb81921f868e1d7e9d868e6078baefebfc101b SHA-256: 2751e6a00e663e127649e5b176f49810c2369ad6582ba653a72d3ec0aab39653
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install a remote support tool, a common tactic for gaining unauthorized access. No scripts were extracted, but the PDF structure and heuristics suggest it's designed to trick users into executing further malicious actions.

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 https://gruntbudowa.pl/files/file/19759231994.pdf In PDF document text
    • http://okmarin.ru/userfiles/file/92427156038.pdfIn PDF document text
    • http://ailizia.com/userfiles/zekalekeneruk.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jujubami.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/podukasa.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/94096749109.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/91911192962.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/voxanajagedasogoj.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ab22417b---jofejopupiluredizipole.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/59144430265.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8eddfd71ae530400b65941cf807139fc/57474993381.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/zabozafedufasov.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613289d51082d---vidunex.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/12027274334.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/wikajadola.pdfIn PDF document text
    • http://rinsacars.com/files/others/josumadexubirovifoj.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/4465282431.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/51572682122.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/50e63e5c100ca543ece46dd210babd52/38018451045.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/19480402429.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/votetazemunikubevim.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3ro1gdtssk5gjpp1vpso289u1g/simevatixisugagojidivog.pdfIn PDF document text
    • http://landpas.pl/upload/file/67794803285.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/didopenezolijuzurigujuju.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/gizuvuterimev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+do+screen+mirroring+from+mobile+to+pcPDF 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_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 18132 bytes
SHA-256: be6b6bde5bd5610623eb8cc9033a91574e25608f3f6c3764246a65dbb823855a
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 11016 bytes
SHA-256: 6269592a38413124307f4932ed7d1103ce8cd780c6cacc4eab1f182be41a26ff
font_02_sfnt_off00012fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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