Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd56aa1e6c3363eb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 10:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7eb3a0671bd0b5598e5856c480800d7e SHA-1: 6d4268a00a41d2950c0bd447377164f064a0f3d4 SHA-256: fd56aa1e6c3363ebb8a9d44d2ca580838eb39ed4120fa3ad474d2f884f166d4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'download' button lure further supports a malicious workflow.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://szyldkj.com/luodan/images/userfiles/file/32374188844.pdf In PDF document text
    • http://suchanekstomatolog.pl/files/file/jakivimodatanatipidikudum.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/2825146155.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/tuwironibixinumiruxapu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/xovelirilagej.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3454e55c---83966692414.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b851374461aebdfc77105ebfeb300b2a/faratuwedakejojatuledas.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/87517206712.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161408263b4b2d---fusur.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/17458077342.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/66169768248.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/30108909806.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/36893614329.pdfIn PDF document text
    • https://greenways.at/userfiles/file/69552338458.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/xotanituve.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210914185430_8tbusn.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/12178270567.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/fadilabidipas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed1c4f6e9---19022676251.pdfIn PDF document text
    • http://iltorg.ru/upload/file/sudejijojabefavapubiw.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/jadevonobepadojajikegefo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/24358803724.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/jowagudadawerax.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///girotuza.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/nefalolikitori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+can+i+see+movies+for+freePDF 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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 18624 bytes
SHA-256: 73838a0dd3706c219fce14594a9d45d2bb0d0796802b25993df91b5f55c6cc37
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 10496 bytes
SHA-256: d6ec8bbc9aa4ad6f19d4a39a85f1aec9daffd14ef07279602b2b0d9a9d12a3d6

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